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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
Common stock, shares outstanding (in shares) 111,830,857        
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 0 102,161 0 102,161
Comprehensive income (loss), net of tax $ 0 0 0 (321) (321)
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
Stock options exercised (in shares) 158,568        
Stock options exercised $ 2 1,743 0 0 1,745
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        
Balances at Dec. 31, 2020 $ 1,118 876,433 246,242 150 1,123,943
Net income         $ 354,064
Shares repurchased and retired (in shares) [1],[2]         0
Shares repurchased and retired [2]         $ 0
Balances (in shares) at Sep. 30, 2021 112,345,594        
Balances at Sep. 30, 2021 $ 1,123 906,478 600,306 31 1,507,938
Common stock, shares outstanding (in shares) 112,080,887        
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 0 0 113,729 0 113,729
Comprehensive income (loss), net of tax $ 0 0 0 (43) (43)
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
Stock options exercised (in shares) 100,068        
Stock options exercised $ 0 1,037 0 0 1,037
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
Common stock, shares outstanding (in shares) 112,223,991        
Net income $ 0 0 138,174 0 138,174
Comprehensive income (loss), net of tax $ 0 0 0 245 245
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)
Shares repurchased and retired (in shares) [1],[2]         0
Shares repurchased and retired [2]         $ 0
Share-based compensation costs $ 0 9,783 0 0 9,783
Stock options exercised (in shares) 112,380        
Stock options exercised $ 1 1,625 0 0 1,626
Balances (in shares) at Sep. 30, 2021 112,345,594        
Balances at Sep. 30, 2021 $ 1,123 906,478 600,306 31 $ 1,507,938
Common stock, shares outstanding (in shares) 112,345,594        
Common stock, shares outstanding (in shares) 111,303,140       111,303,140
Balances (in shares) at Dec. 31, 2021 111,303,140       111,303,140
Balances at Dec. 31, 2021 $ 1,113 827,725 710,088 (180) $ 1,538,746
Net income 0 0 162,928 0 162,928
Comprehensive income (loss), net of tax $ 0 0 0 (184) (184)
Release of restricted stock units, net of tax (in shares) 115,686        
Release of restricted stock units, net of tax $ 1 (2,720) 0 0 (2,719)
Release of performance stock units, net of tax (in shares) 294,344        
Release of performance stock units, net of tax $ 3 (8,113) 0 0 (8,110)
Shares repurchased and retired (in shares) (2,096,660)        
Shares repurchased and retired $ (21) (131,768) 0 0 (131,789)
Dividends declared 0 0 (16,480) 0 (16,480)
Share-based compensation costs $ 0 8,734 0 0 8,734
Balances (in shares) at Mar. 31, 2022 109,616,510        
Balances at Mar. 31, 2022 $ 1,096 693,858 856,536 (364) $ 1,551,126
Balances (in shares) at Dec. 31, 2021 111,303,140       111,303,140
Balances at Dec. 31, 2021 $ 1,113 827,725 710,088 (180) $ 1,538,746
Net income         $ 466,693
Shares repurchased and retired (in shares) [1],[2]         (7,588,000)
Shares repurchased and retired [2]         $ (434,769)
Balances (in shares) at Sep. 30, 2022 104,375,084       104,375,084
Balances at Sep. 30, 2022 $ 1,044 412,267 1,128,619 (1,134) $ 1,540,796
Common stock, shares outstanding (in shares) 109,616,510        
Balances (in shares) at Mar. 31, 2022 109,616,510        
Balances at Mar. 31, 2022 $ 1,096 693,858 856,536 (364) 1,551,126
Net income 0 0 146,763 0 146,763
Comprehensive income (loss), net of tax $ 0 0 0 (619) (619)
Release of restricted stock units, net of tax (in shares) 140,899        
Release of restricted stock units, net of tax $ 1 (2) 0 0 (1)
Release of performance stock units, net of tax (in shares) 307        
Release of performance stock units, net of tax $ 0 (8) 0 0 (8)
Shares repurchased and retired (in shares) (3,018,031)        
Shares repurchased and retired $ (30) (167,954) 0 0 (167,984)
Dividends declared 0 0 (16,026) 0 (16,026)
Share-based compensation costs $ 0 14,099 0 0 14,099
Stock options exercised (in shares) 101,675        
Stock options exercised $ 1 1,804 0 0 1,805
Balances (in shares) at Jun. 30, 2022 106,841,360        
Balances at Jun. 30, 2022 $ 1,068 541,797 987,273 (983) 1,529,155
Common stock, shares outstanding (in shares) 106,841,360        
Net income $ 0 0 157,002 0 157,002
Comprehensive income (loss), net of tax $ 0 0 0 (151) (151)
Release of restricted stock units, net of tax (in shares) 7,407        
Release of performance stock units, net of tax $ 1 (212) 0 0 $ (211)
Shares repurchased and retired (in shares) (2,473,683)       (2,474,000) [1],[2]
Shares repurchased and retired $ (25) (134,971) 0 0 $ (134,996) [2]
Dividends declared 0 0 (15,656) 0 (15,656)
Share-based compensation costs $ 0 5,653 0 0 $ 5,653
Balances (in shares) at Sep. 30, 2022 104,375,084       104,375,084
Balances at Sep. 30, 2022 $ 1,044 $ 412,267 $ 1,128,619 $ (1,134) $ 1,540,796
Common stock, shares outstanding (in shares) 104,375,084       104,375,084
[1] All shares repurchased have been retired and constitute authorized but unissued shares.
[2] Shares repurchased reflect repurchases settled during the three and nine months ended September 30, 2022. These amounts exclude repurchases, if any, traded but not yet settled on or before September 30, 2022.