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Consolidated Statements of Changes in Stockholders' Equity - 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, 2020 111,830,857        
Balances at Dec. 31, 2020 $ 1,118 $ 876,433 $ 246,242 $ 150 $ 1,123,943
Net income 0 0 463,846 0 463,846
Comprehensive income (loss), net of tax $ 0 0 0 (330) $ (330)
Stock options exercised (in shares) 371,016       371,016
Stock options exercised $ 4 4,405 0 0 $ 4,409
Release of restricted stock units, net of tax (in shares) 349,231        
Release of restricted stock units, net of tax $ 3 (8,209) 0 0 (8,206)
Release of performance stock units, net of tax (in shares) 61,983        
Release of performance stock units, net of tax $ 1 (1,908) 0 0 $ (1,907)
Shares repurchased and retired (in shares) (1,309,947)       (1,310,000) [1],[2]
Shares repurchased and retired $ (13) (80,769) 0 0 $ (80,782)
Share-based compensation costs $ 0 37,773 0 0 37,773
Foreign currency translation adjustments         0
Balances (in shares) at Dec. 31, 2021 111,303,140        
Balances at Dec. 31, 2021 $ 1,113 827,725 710,088 (180) 1,538,746
Net income 0 0 639,377 0 639,377
Comprehensive income (loss), net of tax $ 0 0 0 (1,258) $ (1,258)
Stock options exercised (in shares) 165,951       165,951
Stock options exercised $ 1 3,088 0 0 $ 3,089
Release of restricted stock units, net of tax (in shares) 476,292        
Release of restricted stock units, net of tax $ 5 (10,058) 0 0 (10,053)
Release of performance stock units, net of tax (in shares) 294,651        
Release of performance stock units, net of tax $ 3 (8,121) 0 0 $ (8,118)
Shares repurchased and retired (in shares) (9,423,924)       (9,424,000) [1],[2]
Shares repurchased and retired $ (94) (541,548) 0 0 $ (541,642)
Share-based compensation costs 0 34,066 0 0 34,066
Foreign currency translation adjustments 0 0 0 56 56
Dividends declared $ 0 0 (63,638) 0 $ (63,638)
Balances (in shares) at Dec. 31, 2022 102,816,110       102,816,110
Balances at Dec. 31, 2022 $ 1,028 305,152 1,285,827 (1,382) $ 1,590,625
Net income 0 0 620,023 0 620,023
Comprehensive income (loss), net of tax $ 0 0 0 123 $ 123
Stock options exercised (in shares) 32,000       32,000
Stock options exercised $ 0 315 0 0 $ 315
Release of restricted stock units, net of tax (in shares) 202,516        
Release of restricted stock units, net of tax $ 2 (2,081) (4,774) 0 (6,853)
Release of performance stock units, net of tax (in shares) 318,878        
Release of performance stock units, net of tax $ 3 (12,777) 0 0 $ (12,774)
Shares repurchased and retired (in shares) (6,537,051)       (6,537,000) [1],[2]
Shares repurchased and retired $ (65) (322,988) (93,202) 0 $ (416,255)
Share-based compensation costs 0 32,379 0 0 32,379
Foreign currency translation adjustments 0 0 0 161 161
Dividends declared $ 0 0 (63,642) 0 $ (63,642)
Balances (in shares) at Dec. 31, 2023 96,832,453       98,832,453
Balances at Dec. 31, 2023 $ 968 $ 0 $ 1,744,232 $ (1,098) $ 1,744,102
[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, 2023, 2022 and 2021. These amounts exclude repurchases, if any, traded but not yet settled on or before December 31 of each year.