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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, 2021 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        
Balances at Dec. 31, 2021 $ 1,113 827,725 710,088 (180) 1,538,746
Net income         466,693
Foreign currency translation adjustments         $ 0
Shares repurchased and retired (in shares) [1],[2]         (7,588,000)
Foreign currency translation adjustments         $ 0
Balances (in shares) at Sep. 30, 2022 104,375,084        
Balances at Sep. 30, 2022 $ 1,044 412,267 1,128,619 (1,134) 1,540,796
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)
Stock options exercised (in shares) 101,675        
Stock options exercised $ 1 1,804 0 0 1,805
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
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
Net income 0 0 157,002 0 157,002
Comprehensive income (loss), net of tax $ 0 0 0 (151) (151)
Foreign currency translation adjustments         0
Release of restricted stock units, net of tax (in shares) 7,407        
Release of restricted 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)
Dividends declared 0 0 (15,656) 0 (15,656)
Share-based compensation costs $ 0 5,653 0 0 5,653
Foreign currency translation adjustments         0
Balances (in shares) at Sep. 30, 2022 104,375,084        
Balances at Sep. 30, 2022 $ 1,044 412,267 1,128,619 (1,134) $ 1,540,796
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 0 199,731 0 199,731
Comprehensive income (loss), net of tax 0 0 0 474 474
Foreign currency translation adjustments $ 0 0 0 4 4
Stock options exercised (in shares) 32,000        
Stock options exercised $ 0 315 0 0 315
Release of restricted stock units, net of tax (in shares) 45,942        
Release of restricted stock units, net of tax $ 1 (1,926) 0 0 (1,925)
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) (1,726,308)        
Shares repurchased and retired $ (17) (106,994) 0 0 (107,011)
Dividends declared 0 0 (16,289) 0 (16,289)
Share-based compensation costs 0 7,819 0 0 7,819
Foreign currency translation adjustments $ 0 0 0 4 4
Balances (in shares) at Mar. 31, 2023 101,486,622        
Balances at Mar. 31, 2023 $ 1,015 191,589 1,469,269 (904) $ 1,660,969
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         527,418
Foreign currency translation adjustments         $ (54)
Shares repurchased and retired (in shares) [1],[2]         (4,847,000)
Foreign currency translation adjustments         $ (54)
Balances (in shares) at Sep. 30, 2023 98,386,239       98,386,239
Balances at Sep. 30, 2023 $ 984 3,355 1,765,111 (969) $ 1,768,481
Balances (in shares) at Mar. 31, 2023 101,486,622        
Balances at Mar. 31, 2023 $ 1,015 191,589 1,469,269 (904) 1,660,969
Net income 0 0 192,454 0 192,454
Comprehensive income (loss), net of tax 0 0 0 112 112
Foreign currency translation adjustments $ 0 0 0 196 196
Release of restricted stock units, net of tax (in shares) 17,871        
Release of restricted stock units, net of tax $ 0 (63) 0 0 (63)
Shares repurchased and retired (in shares) (1,492,451)        
Shares repurchased and retired $ (15) (101,001) 0 0 (101,016)
Dividends declared 0 0 (16,041) 0 (16,041)
Share-based compensation costs 0 12,198 0 0 12,198
Foreign currency translation adjustments $ 0 0 0 196 196
Balances (in shares) at Jun. 30, 2023 100,012,042        
Balances at Jun. 30, 2023 $ 1,000 102,723 1,645,682 (596) 1,748,809
Net income 0 0 135,233 0 135,233
Comprehensive income (loss), net of tax 0 0 0 (119) (119)
Foreign currency translation adjustments $ 0 0 0 (254) (254)
Release of restricted stock units, net of tax (in shares) 1,974        
Release of restricted stock units, net of tax $ 0 (56) 0 0 $ (56)
Shares repurchased and retired (in shares) (1,627,777)       (1,628,000) [1],[2]
Shares repurchased and retired $ (16) (107,345) 0 0 $ (107,361)
Dividends declared 0 0 (15,804) 0 (15,804)
Share-based compensation costs 0 8,033 0 0 8,033
Foreign currency translation adjustments $ 0 0 0 (254) $ (254)
Balances (in shares) at Sep. 30, 2023 98,386,239       98,386,239
Balances at Sep. 30, 2023 $ 984 $ 3,355 $ 1,765,111 $ (969) $ 1,768,481
[1] All shares repurchased have been retired and constitute authorized but unissued shares.
[2] Shares repurchased reflect repurchases settled during the three and six months ended June 30, 2023 and 2022. These amounts exclude repurchases, if any, traded but not yet settled on or before June 30, 2023 and 2022, respectively.