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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 Deficit)
Accumulated Other Comprehensive Income (Loss), Net
Noncontrolling Interest
Balances at Dec. 31, 2016 $ 930,180 $ 1,129 $ 953,440 $ (23,824) $ (615) $ 50
Balance, shares at Dec. 31, 2016   112,896,377        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 107,317 $ 0 0 107,317 0 0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income 15,777 0 0 15,777 0 0
Other Comprehensive Income (Loss), Net of Tax 801 $ 0 0 0 801 0
Stock options exercised   233,964        
Stock options exercised 2,023 $ 2 2,021 0 0 0
Release of restricted stock units, net of tax   156,750        
Release of restricted stock units, net of tax (2,225) $ 1 (2,226) 0 0 0
Release of performance stock units, net of tax   173,653        
Stock Issued During Period, Value, Performance Stock Award, Net of Forfeitures (1,791) $ 2 (1,793) 0 0 0
Stock Repurchased and Retired During Period, Shares   (870,315)        
Stock Repurchased and Retired During Period, Value (22,160) $ (8) (22,152) 0 0 0
Dividends, Cash (11,286) 0 0 (11,286) 0 0
Share-based compensation costs 11,212 0 11,212 0 0 0
Noncontrolling Interest, Decrease from Deconsolidation (590)   640     (50)
Balances at Sep. 30, 2017 1,030,438 $ 1,126 941,142 87,984 186 0
Balance, shares at Sep. 30, 2017   112,590,429.000        
Balances at Dec. 31, 2017 $ 1,097,227 $ 1,126 931,858 164,425 (182) 0
Balance, shares at Dec. 31, 2017 112,634,418 112,634,418        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income $ 92,181 $ 0 0 92,181 0 0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income 0 0 0 (312) 312 0
Other Comprehensive Income (Loss), Net of Tax (1,132) $ 0 0 0 (1,132) 0
Stock options exercised   286,490        
Stock options exercised 2,820 $ 3 2,817 0 0 0
Release of restricted stock units, net of tax   18,777        
Release of restricted stock units, net of tax (387) $ 0 (387) 0 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 0
Stock Repurchased and Retired During Period, Shares   (1,272,895)        
Stock Repurchased and Retired During Period, Value (44,822) $ (13) (44,809) 0 0 0
Dividends, Cash (19,098) 0 0 (19,098) 0 0
Share-based compensation costs 20,316 0 20,316 0 0 0
Balances at Sep. 30, 2018 $ 1,141,835 $ 1,120 $ 904,521 $ 237,196 $ (1,002) $ 0
Balance, shares at Sep. 30, 2018 112,004,327 112,004,327.000