Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Supplemental Equity and Accumulated Other Comprehensive Income (Loss) - Consolidated Changes in Equity (Details)

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Note 7 - Supplemental Equity and Accumulated Other Comprehensive Income (Loss) - Consolidated Changes in Equity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Balance (in shares)     37,607,500       37,607,500  
Balance $ 1,096,425 $ 1,109,469 $ 1,079,061 $ 997,819 $ 960,082 $ 949,627 $ 1,079,061 $ 949,627
Cumulative effect adjustments due to adoption of new accounting standards     98       98  
Net earnings 44,654 17,556 17,403 19,738 48,847 15,863 79,612 84,449
Other comprehensive income (loss) 3,378 (12,379) (1,136) 40,956 (7,058) (824) $ (10,137) $ 33,073
Share repurchases (15,404)          
Surrender and retirement of stock to exercise options 0    
Common stock issued for exercise of options (in shares)             263,995 139,602
Common stock issued for exercise of options 7,337 2,408 15,611 6,273 2,893 3,051    
Common stock issued for restricted stock awards (1,909) (227)    
Cash dividends (12,086) (12,086) (12,066) (11,992) (11,988) (11,958)    
Stock-based compensation expense 5,640 6,784 11,327 4,669 4,985 3,718    
Common stock issued to employee stock purchase plan 834 842 752 755    
Employee stock purchase plan expense $ 84 77 238 78 59 77    
Balance (in shares) 37,813,367           37,813,367  
Balance $ 1,146,266 $ 1,096,425 $ 1,109,469 $ 1,058,292 $ 997,819 $ 960,082 $ 1,146,266 $ 1,058,292
Common Stock [Member]                
Balance (in shares) 37,735,000 37,803,000 37,608,000 37,470,000 37,409,000 37,356,000 37,608,000 37,356,000
Balance $ 377 $ 378 $ 376 $ 375 $ 374 $ 374 $ 376 $ 374
Cumulative effect adjustments due to adoption of new accounting standards            
Net earnings    
Other comprehensive income (loss)    
Share repurchases (1)          
Surrender and retirement of stock to exercise options    
Common stock issued for exercise of options (in shares) 73,000 24,000 166,000 68,000 38,000 33,000    
Common stock issued for exercise of options $ 1 $ 0 $ 2 $ 1 $ 0    
Common stock issued for restricted stock awards (in shares) 1,000 3,000 24,000   22,000 13,000    
Common stock issued for restricted stock awards $ 0 $ 0 $ 0 $ 0 $ 0    
Cash dividends    
Stock-based compensation expense    
Common stock issued to employee stock purchase plan (in shares) 4,000 0 5,000 7,000   7,000    
Common stock issued to employee stock purchase plan $ 0 $ 0 $ 0 $ 0    
Employee stock purchase plan expense    
Share repurchases (in shares)   (95,000)            
Balance (in shares) 37,813,000 37,735,000 37,803,000 37,545,000 37,470,000 37,409,000 37,813,000 37,545,000
Balance $ 378 $ 377 $ 378 $ 375 $ 375 $ 374 $ 378 $ 375
Additional Paid-in Capital [Member]                
Balance 283,854 274,584 246,568 214,697 206,762 199,161 246,568 199,161
Cumulative effect adjustments due to adoption of new accounting standards            
Net earnings    
Other comprehensive income (loss)    
Share repurchases          
Surrender and retirement of stock to exercise options    
Common stock issued for exercise of options 7,336 2,408 15,609 6,273 2,892 3,051    
Common stock issued for restricted stock awards    
Cash dividends    
Stock-based compensation expense 5,640 6,784 11,327 4,669 4,985 3,718    
Common stock issued to employee stock purchase plan 834 842 752 755    
Employee stock purchase plan expense 84 77 238 78 59 77    
Balance 297,748 283,854 274,584 226,469 214,697 206,762 297,748 226,469
Retained Earnings [Member]                
Balance 895,205 905,139 876,931 839,564 802,705 799,027 876,931 799,027
Cumulative effect adjustments due to adoption of new accounting standards     24,780       24,780  
Net earnings 44,654 17,556 17,403 19,738 48,847 15,863    
Other comprehensive income (loss)    
Share repurchases (15,404)          
Surrender and retirement of stock to exercise options    
Common stock issued for exercise of options    
Common stock issued for restricted stock awards 0 (1,909) 0 (227)    
Cash dividends (12,086) (12,086) (12,066) (11,992) (11,988) (11,958)    
Stock-based compensation expense    
Common stock issued to employee stock purchase plan    
Employee stock purchase plan expense    
Balance 927,773 895,205 905,139 847,310 839,564 802,705 927,773 847,310
AOCI Attributable to Parent [Member]                
Balance (83,011) (70,632) (44,814) (56,817) (49,759) (48,935) (44,814) (48,935)
Cumulative effect adjustments due to adoption of new accounting standards     (24,682)       (24,682)  
Net earnings    
Other comprehensive income (loss) 3,378 (12,379) (1,136) 40,956 (7,058) (824)    
Share repurchases          
Surrender and retirement of stock to exercise options    
Common stock issued for exercise of options    
Common stock issued for restricted stock awards    
Cash dividends    
Stock-based compensation expense    
Common stock issued to employee stock purchase plan    
Employee stock purchase plan expense    
Balance $ (79,633) $ (83,011) $ (70,632) $ (15,862) $ (56,817) $ (49,759) $ (79,633) $ (15,862)