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Condensed Consolidated Statement of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss), Net
Common Stock, Dividends, Per Share, Declared $ 0.05        
Balances at Dec. 31, 2017 $ 1,097,227 $ 1,126 $ 931,858 $ 164,425 $ (182)
Balance, shares at Dec. 31, 2017   112,634,418      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 41,399 $ 0 0 41,399 0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income 0 0 0 (312) 312
Other Comprehensive Income (Loss), Net of Tax (964) $ 0 0 0 (964)
Stock options exercised   221,400      
Stock options exercised 2,045 $ 2 2,043 0 0
Release of restricted stock units, net of tax   16,957      
Release of restricted stock units, net of tax (364) $ 0 (364) 0 0
Release of performance stock units, net of tax   337,537      
Stock Issued During Period, Value, Performance Stock Award, Net of Forfeitures (5,270) $ 4 (5,274) 0 0
Stock Repurchased and Retired During Period, Shares   (559,089)      
Stock Repurchased and Retired During Period, Value (19,803) $ (6) (19,797) 0 0
Dividends, Cash (5,635) 0 0 (5,635) 0
Share-based compensation costs 8,927 0 8,927 0 0
Balances at Mar. 31, 2018 $ 1,117,562 $ 1,126 917,393 199,877 (834)
Balance, shares at Mar. 31, 2018   112,651,223.000      
Common Stock, Dividends, Per Share, Declared $ 0.06        
Balances at Dec. 31, 2018 $ 1,145,741 $ 1,118 892,331 253,357 (1,065)
Balance, shares at Dec. 31, 2018 111,757,105 111,757,105      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 45,451 $ 0 0 45,451 0
Other Comprehensive Income (Loss), Net of Tax 465 $ 0 0 0 465
Stock options exercised   137,063      
Stock options exercised 1,262 $ 1 1,261 0 0
Release of restricted stock units, net of tax   46,958      
Release of restricted stock units, net of tax (418) $ 0 (418) 0 0
Release of performance stock units, net of tax   270,960      
Stock Issued During Period, Value, Performance Stock Award, Net of Forfeitures (3,765) $ 3 (3,768) 0 0
Stock Repurchased and Retired During Period, Shares   (830,100)      
Stock Repurchased and Retired During Period, Value (21,653) $ (8) (21,645) 0 0
Dividends, Cash (6,683) 0 0 (6,683) 0
Share-based compensation costs 9,709 0 9,709 0 0
Balances at Mar. 31, 2019 $ 1,170,109 $ 1,114 $ 877,470 $ 292,125 $ (600)
Balance, shares at Mar. 31, 2019 111,381,986 111,381,986.000