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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balances (in shares) at Dec. 31, 2019 111,542,108        
Balances at Dec. 31, 2019 $ 1,115 $ 883,715 $ 380,942 $ (530) $ 1,265,242
Net income (loss) 0 0 (147,559) 0 (147,559)
Comprehensive income (loss), net of tax $ 0 0 0 1,127 1,127
Stock options exercised (in shares) 3,000        
Stock options exercised $ 0 25 0 0 25
Release of restricted stock units, net of tax (in shares) 76,502        
Release of restricted stock units, net of tax $ 1 (767) 0 0 (766)
Release of performance stock units, net of tax (in shares) 241,118        
Release of performance stock units, net of tax $ 2 (3,372) 0 0 (3,370)
Share-based compensation costs $ 0 8,191 0 0 8,191
Shares repurchased and retired (in shares) (682,596)        
Shares repurchased and retired $ (6) (11,114) 0 0 (11,120)
Balances (in shares) at Mar. 31, 2020 111,180,132        
Balances at Mar. 31, 2020 $ 1,112 876,678 233,383 597 1,111,770
Balances (in shares) at Dec. 31, 2019 111,542,108        
Balances at Dec. 31, 2019 $ 1,115 883,715 380,942 (530) 1,265,242
Net income (loss)         $ (217,987)
Shares repurchased and retired (in shares)         (700,000)
Shares repurchased and retired         $ (11,100)
Balances (in shares) at Sep. 30, 2020 111,539,603        
Balances at Sep. 30, 2020 $ 1,115 879,450 162,955 391 1,043,911
Balances (in shares) at Mar. 31, 2020 111,180,132        
Balances at Mar. 31, 2020 $ 1,112 876,678 233,383 597 1,111,770
Net income (loss) 0 0 (108,544) 0 (108,544)
Comprehensive income (loss), net of tax $ 0 0 0 (445) (445)
Stock options exercised (in shares) 1,000        
Stock options exercised $ 0 8 0 0 8
Release of restricted stock units, net of tax (in shares) 183,741        
Release of restricted stock units, net of tax $ 2 (6) 0 0 (4)
Release of performance stock units, net of tax (in shares) 20,082        
Release of performance stock units, net of tax $ 1 0 0 0 1
Share-based compensation costs $ 0 2,693 0 0 2,693
Shares repurchased and retired (in shares) 0        
Shares repurchased and retired $ (1) 0 0 0 (1)
Balances (in shares) at Jun. 30, 2020 111,384,955        
Balances at Jun. 30, 2020 $ 1,114 879,373 124,839 152 1,005,478
Net income (loss) 0 0 38,116 0 38,116
Comprehensive income (loss), net of tax $ 0 0 0 239 239
Stock options exercised (in shares) 139,065        
Stock options exercised $ 1 1,159 0 0 1,160
Release of restricted stock units, net of tax (in shares) 15,583        
Release of restricted stock units, net of tax $ 0 (224) 0 0 (224)
Release of performance stock units, net of tax (in shares) 0        
Release of performance stock units, net of tax $ 0 0 0 0 $ 0
Shares repurchased and retired (in shares) 0       0
Shares repurchased and retired $ 0 0 0 0 $ 0
Share-based compensation costs $ 0 (858) 0 0 (858)
Balances (in shares) at Sep. 30, 2020 111,539,603        
Balances at Sep. 30, 2020 $ 1,115 879,450 162,955 391 $ 1,043,911
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
Net income (loss) 0 0 102,161 0 102,161
Comprehensive income (loss), net of tax $ 0 0 0 (321) (321)
Stock options exercised (in shares) 158,568        
Stock options exercised $ 2 1,743 0 0 1,745
Release of restricted stock units, net of tax (in shares) 29,808        
Release of restricted stock units, net of tax $ 0 (609) 0 0 (609)
Release of performance stock units, net of tax (in shares) 61,654        
Release of performance stock units, net of tax $ 1 (1,901) 0 0 (1,900)
Share-based compensation costs $ 0 5,701 0 0 5,701
Balances (in shares) at Mar. 31, 2021 112,080,887        
Balances at Mar. 31, 2021 $ 1,121 881,367 348,403 (171) $ 1,230,720
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
Net income (loss)         $ 354,064
Shares repurchased and retired (in shares)         0
Balances (in shares) at Sep. 30, 2021 112,345,594       112,345,594
Balances at Sep. 30, 2021 $ 1,123 906,478 600,306 31 $ 1,507,938
Balances (in shares) at Mar. 31, 2021 112,080,887        
Balances at Mar. 31, 2021 $ 1,121 881,367 348,403 (171) 1,230,720
Net income (loss) 0 0 113,729 0 113,729
Comprehensive income (loss), net of tax $ 0 0 0 (43) (43)
Stock options exercised (in shares) 100,068        
Stock options exercised $ 0 1,037 0 0 1,037
Release of restricted stock units, net of tax (in shares) 43,036        
Release of restricted stock units, net of tax $ 1 0 0 0 1
Share-based compensation costs $ 0 12,823 0 0 12,823
Balances (in shares) at Jun. 30, 2021 112,223,991        
Balances at Jun. 30, 2021 $ 1,122 895,227 462,132 (214) 1,358,267
Net income (loss) 0 0 138,174 0 138,174
Comprehensive income (loss), net of tax $ 0 0 0 245 245
Stock options exercised (in shares) 112,380        
Stock options exercised $ 1 1,625 0 0 1,626
Release of restricted stock units, net of tax (in shares) 8,894        
Release of restricted stock units, net of tax $ 0 (150) 0 0 (150)
Release of performance stock units, net of tax (in shares) 329        
Release of performance stock units, net of tax $ 0 (7) 0 0 (7)
Share-based compensation costs $ 0 9,783 0 0 $ 9,783
Shares repurchased and retired (in shares)         0
Balances (in shares) at Sep. 30, 2021 112,345,594       112,345,594
Balances at Sep. 30, 2021 $ 1,123 $ 906,478 $ 600,306 $ 31 $ 1,507,938