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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, 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 45,451 0 45,451
Comprehensive income (loss), net of tax $ 0 0 0 465 465
Stock options exercised (in shares) 137,063        
Stock options exercised $ 1 1,261 0 0 1,262
Release of restricted stock units, net of tax (in shares) 46,958        
Release of restricted stock units, net of tax $ 0 (418) 0 0 (418)
Release of performance stock units, net of tax (in shares) 270,960        
Release of performance stock units, net of tax $ 3 (3,768) 0 0 (3,765)
Shares repurchased and retired (in shares) (830,100)        
Shares repurchased and retired $ (8) (21,645) 0 0 (21,653)
Share-based compensation costs 0 9,709 0 0 9,709
Dividends declared $ 0 0 (6,683) 0 (6,683)
Balances (in shares) at Mar. 31, 2019 111,381,986        
Balances at Mar. 31, 2019 $ 1,114 877,470 292,125 (600) 1,170,109
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)         $ 133,340
Shares repurchased and retired (in shares) [1]         (1,087,000)
Balances (in shares) at Sep. 30, 2019 111,144,780        
Balances at Sep. 30, 2019 $ 1,111 882,652 364,453 (69) $ 1,248,147
Balances (in shares) at Mar. 31, 2019 111,381,986        
Balances at Mar. 31, 2019 $ 1,114 877,470 292,125 (600) 1,170,109
Net income (loss) 0 0 48,484 0 48,484
Comprehensive income (loss), net of tax 0 0 0 (12) (12)
Stock options exercised $ 0 0 0 0 0
Release of restricted stock units, net of tax (in shares) 13,075        
Release of restricted stock units, net of tax $ 1 (136) 0 0 (135)
Release of performance stock units, net of tax $ 0 0 0 0 0
Shares repurchased and retired (in shares) (245,221)        
Shares repurchased and retired $ (4) (6,104) 0 0 (6,108)
Share-based compensation costs 0 8,158 0 0 8,158
Dividends declared $ 0 0 (7,781) 0 (7,781)
Balances (in shares) at Jun. 30, 2019 111,149,840        
Balances at Jun. 30, 2019 $ 1,111 879,388 332,828 (612) 1,212,715
Net income (loss) 0 0 39,405 0 39,405
Comprehensive income (loss), net of tax $ 0 0 0 543 543
Stock options exercised (in shares) 3,416        
Stock options exercised $ 0 27 0 0 27
Release of restricted stock units, net of tax (in shares) 2,878        
Release of restricted stock units, net of tax $ 0 (38) 0 0 (38)
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) (11,354)       (11,000) [1]
Shares repurchased and retired $ 0 (284) 0 0 $ (284)
Share-based compensation costs 0 3,559 0 0 3,559
Dividends declared $ 0 0 (7,780) 0 (7,780)
Balances (in shares) at Sep. 30, 2019 111,144,780        
Balances at Sep. 30, 2019 $ 1,111 882,652 364,453 (69) $ 1,248,147
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 (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)
Shares repurchased and retired (in shares) (682,596)        
Shares repurchased and retired $ (6) (11,114) 0 0 (11,120)
Share-based compensation costs $ 0 8,191 0 0 8,191
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       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) [1]         (683,000)
Balances (in shares) at Sep. 30, 2020 111,539,603       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
Shares repurchased and retired (1) 0 0 0 (1)
Share-based compensation costs $ 0 2,693 0 0 2,693
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 0 0 0 0 $ 0
Shares repurchased and retired (in shares) [1]         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       111,539,603
Balances at Sep. 30, 2020 $ 1,115 $ 879,450 $ 162,955 $ 391 $ 1,043,911
[1] All shares repurchased have been retired and constitute authorized but unissued shares.