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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, 2017 112,634,418        
Balances at Dec. 31, 2017 $ 1,126 $ 931,858 $ 164,425 $ (182) $ 1,097,227
Net income 0 0 41,399 0 41,399
Comprehensive income (loss), net of tax $ 0 0 0 (964) (964)
Stock options exercised (in shares) 221,400        
Stock options exercised $ 2 2,043 0 0 2,045
Release of restricted stock units, net of tax (in shares) 16,957        
Release of restricted stock units, net of tax $ 0 (364) 0 0 (364)
Release of performance stock units, net of tax (in shares) 337,537        
Release of performance stock units, net of tax $ 4 (5,274) 0 0 (5,270)
Shares repurchased and retired (in shares) (559,089)        
Shares repurchased and retired $ (6) (19,797) 0 0 (19,803)
Dividends declared 0 0 (5,635) 0 (5,635)
Share-based compensation costs 0 8,927 0 0 8,927
Cumulative effect of change in accounting principle, adoption of Update 2018-02 $ 0 0 (312) 312 0
Release of performance stock units, net of tax (in shares) 337,537        
Balances (in shares) at Mar. 31, 2018 112,651,223        
Balances at Mar. 31, 2018 $ 1,126 917,393 199,877 (834) 1,117,562
Balances (in shares) at Dec. 31, 2017 112,634,418        
Balances at Dec. 31, 2017 $ 1,126 931,858 164,425 (182) 1,097,227
Net income         $ 80,344
Shares repurchased and retired (in shares) [1],[2]         860,000
Shares repurchased and retired [2]         $ (30,332)
Balances (in shares) at Jun. 30, 2018 112,370,340        
Balances at Jun. 30, 2018 $ 1,124 913,096 232,080 (1,140) 1,145,160
Balances (in shares) at Mar. 31, 2018 112,651,223        
Balances at Mar. 31, 2018 $ 1,126 917,393 199,877 (834) 1,117,562
Net income 0 0 38,945 0 38,945
Comprehensive income (loss), net of tax $ 0 0 0 (306) (306)
Stock options exercised (in shares) 19,836        
Stock options exercised $ 0 208 0 0 208
Release of restricted stock units, net of tax (in shares) 0        
Release of restricted stock units, net of tax $ 0 0 0 0 0
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) (300,719)       301,000 [1],[2]
Shares repurchased and retired $ (2) (10,527) 0 0 $ (10,529) [2]
Dividends declared 0 0 (6,742) 0 (6,742)
Share-based compensation costs $ 0 6,022 0 0 6,022
Release of performance stock units, net of tax (in shares) 0        
Balances (in shares) at Jun. 30, 2018 112,370,340        
Balances at Jun. 30, 2018 $ 1,124 913,096 232,080 (1,140) $ 1,145,160
Balances (in shares) at Dec. 31, 2018 111,757,105       111,757,105
Balances at Dec. 31, 2018 $ 1,118 892,331 253,357 (1,065) $ 1,145,741
Net income 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)
Dividends declared 0 0 (6,683) 0 (6,683)
Share-based compensation costs $ 0 9,709 0 0 9,709
Release of performance stock units, net of tax (in shares) 270,960        
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       111,757,105
Balances at Dec. 31, 2018 $ 1,118 892,331 253,357 (1,065) $ 1,145,741
Net income         $ 93,935
Shares repurchased and retired (in shares) [1],[2]         1,075,000
Shares repurchased and retired [2]         $ (27,760)
Balances (in shares) at Jun. 30, 2019 111,149,840       111,149,840
Balances at Jun. 30, 2019 $ 1,111 879,388 332,828 (612) $ 1,212,715
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 0 0 48,484 0 48,484
Comprehensive income (loss), net of tax $ 0 0 0 (12) (12)
Stock options exercised (in shares) 0        
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 (in shares) 0        
Release of performance stock units, net of tax $ 0 0 0 0 $ 0
Shares repurchased and retired (in shares) (245,221)       245,000 [1],[2]
Shares repurchased and retired $ (4) (6,104) 0 0 $ (6,108) [2]
Dividends declared 0 0 (7,781) 0 (7,781)
Share-based compensation costs $ 0 8,158 0 0 $ 8,158
Release of performance stock units, net of tax (in shares) 0        
Balances (in shares) at Jun. 30, 2019 111,149,840       111,149,840
Balances at Jun. 30, 2019 $ 1,111 $ 879,388 $ 332,828 $ (612) $ 1,212,715
[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, 2019 and 2018. These amounts exclude repurchases traded but not yet settled on or before June 30, 2019 and 2018.