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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Additional Paid-in Capital [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
AOCI Attributable to Parent [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balances (in shares) at Dec. 31, 2017           112,634,418        
Balances (Accounting Standards Update 2018-02 [Member]) at Dec. 31, 2017 $ 0 $ 0 $ (312) $ 312 $ 0          
Balances at Dec. 31, 2017           $ 1,126 $ 931,858 $ 164,425 $ (182) $ 1,097,227
Net income (loss)           0 0 115,048 0 115,048
Comprehensive income (loss), net of tax           $ 0 0 0 (1,195) $ (1,195)
Stock options exercised (in shares)           338,426       338,426
Stock options exercised           $ 3 3,539 0 0 $ 3,542
Release of restricted stock units, net of tax (in shares)           300,177        
Release of restricted stock units, net of tax           $ 3 (3,619) 0 0 (3,616)
Release of performance stock units, net of tax (in shares)           337,537        
Release of performance stock units, net of tax           $ 4 (5,274) 0 0 $ (5,270)
Shares repurchased and retired (in shares)           (1,853,453)       (1,853,000) [1],[2]
Shares repurchased and retired           $ (18) (59,552) 0 0 $ (59,570) [2]
Dividends declared           0 0 (25,804) 0 (25,804)
Share-based compensation costs           $ 0 25,379 0 0 25,379
Balances (in shares) at Dec. 31, 2018           111,757,105        
Balances at Dec. 31, 2018           $ 1,118 892,331 253,357 (1,065) 1,145,741
Net income (loss)           0 0 157,636 0 157,636
Comprehensive income (loss), net of tax           $ 0 0 0 535 $ 535
Stock options exercised (in shares)           242,357       242,357
Stock options exercised           $ 2 2,375 0 0 $ 2,377
Release of restricted stock units, net of tax (in shares)           358,361        
Release of restricted stock units, net of tax           $ 4 (4,391) 0 0 (4,387)
Release of performance stock units, net of tax (in shares)           270,960        
Release of performance stock units, net of tax           $ 3 (3,769) 0 0 $ (3,766)
Shares repurchased and retired (in shares)           (1,086,675)       (1,087,000) [1],[2]
Shares repurchased and retired           $ (12) (28,033) 0 0 $ (28,045) [2]
Dividends declared           0 0 (30,051) 0 (30,051)
Share-based compensation costs           $ 0 25,202 0 0 $ 25,202
Balances (in shares) at Dec. 31, 2019           111,542,108       111,542,108
Balances at Dec. 31, 2019           $ 1,115 883,715 380,942 (530) $ 1,265,242
Net income (loss)           0 0 (134,700) 0 (134,700)
Comprehensive income (loss), net of tax           $ 0 0 0 680 $ 680
Stock options exercised (in shares)           240,380       240,380
Stock options exercised           $ 2 1,977 0 0 $ 1,979
Release of restricted stock units, net of tax (in shares)           469,765        
Release of restricted stock units, net of tax           $ 5 (3,975) 0 0 (3,970)
Release of performance stock units, net of tax (in shares)           261,200        
Release of performance stock units, net of tax           $ 3 (3,372) 0 0 $ (3,369)
Shares repurchased and retired (in shares)           (682,596)       (683,000) [1],[2]
Shares repurchased and retired           $ (7) (11,114) 0 0 $ (11,121) [2]
Share-based compensation costs           $ 0 9,202 0 0 $ 9,202
Balances (in shares) at Dec. 31, 2020           111,830,857       111,830,857
Balances at Dec. 31, 2020           $ 1,118 $ 876,433 $ 246,242 $ 150 $ 1,123,943
[1] All shares repurchased have been retired and constitute authorized but unissued shares.
[2] Shares repurchased reflect repurchases settled during the twelve months ended December 31, 2020, 2019 and 2018. These amounts exclude repurchases, if any, traded but not yet settled on or before December 31, 2020, 2019 and 2018.