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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Total
Balances at Dec. 31, 2013 $ 1,671 $ 226,595 $ 2,274,784 $ (1,490,598) $ 1,012,452
Comprehensive income:          
Net earnings 374,792 374,792
Cash dividend declared and paid (93,604) (93,604)
Tax benefit of stock options exercised and restricted shares issued 16,645 16,645
Purchase of treasury shares (125,000) (125,000)
Share-based compensation 35,333 35,333
Stock option exercises and restricted share issuances, net of stock repurchased for payroll taxes (30,932) 14,837 (16,095)
Balances at Dec. 31, 2014 1,671 247,641 2,555,972 (1,600,761) 1,204,523
Comprehensive income:          
Net earnings 427,235 427,235
Cash dividend declared and paid (97,364) (97,364)
Tax benefit of stock options exercised and restricted shares issued 12,877 12,877
Purchase of treasury shares (262,275) (262,275)
Share-based compensation 37,228 37,228
Stock option exercises and restricted share issuances, net of stock repurchased for payroll taxes (29,018) 7,146 (21,872)
Balances at Dec. 31, 2015 1,671 268,728 2,885,843 (1,855,890) 1,300,352
Comprehensive income:          
Net earnings 432,090 432,090
Cash dividend declared and paid (98,990) (98,990)
Tax benefit of stock options exercised and restricted shares issued 7,044 7,044
Purchase of treasury shares (249,760) (249,760)
Share-based compensation 40,625 40,625
Stock option exercises and restricted share issuances, net of stock repurchased for payroll taxes (23,310) 6,010 (17,300)
Balances at Dec. 31, 2016 $ 1,671 $ 293,087 $ 3,218,943 $ (2,099,640) $ 1,414,061