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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Total
Balances at Dec. 31, 2017 $ 1,671 $ 310,811 $ 3,803,844 $ (2,277,001) $ 1,839,325
Comprehensive income:          
Net earnings 0 0 400,904 0 400,904
Cash dividend declared and paid 0 0 (78,785) 0 (78,785)
Purchase of treasury shares 0 0 0 (100,027) (100,027)
Share-based compensation 0 37,184 0 0 37,184
Restricted share issuances, net of stock repurchased for payroll taxes and other 0 (16,018) 0 (2,005) (18,023)
Balances at Dec. 31, 2017 1,671 310,811 3,803,844 (2,277,001) 1,839,325
Balances at Sep. 30, 2018 1,671 331,977 4,125,963 (2,379,033) 2,080,578
Balances at Jun. 30, 2018 1,671 337,290 4,021,055 (2,326,654) 2,033,362
Comprehensive income:          
Net earnings 0 0 131,110 0 131,110
Cash dividend declared and paid 0 0 (26,202) 0 (26,202)
Purchase of treasury shares 0 0 0 (50,000) (50,000)
Share-based compensation 0 11,184 0 0 11,184
Restricted share issuances, net of stock repurchased for payroll taxes and other 0 (16,497) 0 (2,379) (18,876)
Balances at Jun. 30, 2018 1,671 337,290 4,021,055 (2,326,654) 2,033,362
Balances at Sep. 30, 2018 1,671 331,977 4,125,963 (2,379,033) 2,080,578
Balances at Dec. 31, 2018 1,671 340,457 4,188,435 (2,429,179) 2,101,384
Comprehensive income:          
Net earnings 0 0 371,644 0 371,644
Cash dividend declared and paid 0 0 (84,087) 0 (84,087)
Purchase of treasury shares 0 0 0 (225,680) (225,680)
Share-based compensation 0 42,154 0 0 42,154
Restricted share issuances, net of stock repurchased for payroll taxes and other 0 (14,668) 0 2,782 (11,886)
Balances at Dec. 31, 2018 1,671 340,457 4,188,435 (2,429,179) 2,101,384
Balances at Sep. 30, 2019 1,671 367,943 4,475,992 (2,652,077) 2,193,529
Balances at Jun. 30, 2019 1,671 367,166 4,385,391 (2,618,872) 2,135,356
Comprehensive income:          
Net earnings 0 0 118,410 0 118,410
Cash dividend declared and paid 0 0 (27,809) 0 (27,809)
Purchase of treasury shares 0 0 0 (35,946) (35,946)
Share-based compensation 0 13,850 0 0 13,850
Restricted share issuances, net of stock repurchased for payroll taxes and other 0 (13,073) 0 2,741 (10,332)
Balances at Jun. 30, 2019 1,671 367,166 4,385,391 (2,618,872) 2,135,356
Balances at Sep. 30, 2019 $ 1,671 $ 367,943 $ 4,475,992 $ (2,652,077) $ 2,193,529