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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 35,451 $ 0 537 35,451 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 571 $ 0 0 0 571 0
Stock options exercised   16,050        
Stock options exercised 127 $ 0 127 0 0 0
Release of restricted stock units, net of tax   142,998        
Release of restricted stock units, net of tax (2,162) $ 1 (2,163) 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, Value 0          
Share-based compensation costs 3,083 0 3,083 0 0 0
Noncontrolling Interest, Decrease from Deconsolidation (487)         (50)
Balances at Mar. 31, 2017 981,723 $ 1,132 953,231 27,404 (44) 0
Balance, shares at Mar. 31, 2017   113,229,078.000        
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 $ 41,399 $ 0 0 41,399 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 (964) $ 0 0 0 (964) 0
Stock options exercised   221,400        
Stock options exercised 2,045 $ 2 2,043 0 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 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   (559,089)        
Stock Repurchased and Retired During Period, Value (19,803) $ (6) (19,797) 0 0 0
Dividends, Cash (5,635) 0 0 (5,635) 0 0
Share-based compensation costs 8,927 0 8,927 0 0 0
Balances at Mar. 31, 2018 $ 1,117,562 $ 1,126 $ 917,393 $ 199,877 $ (834) $ 0
Balance, shares at Mar. 31, 2018 112,651,223 112,651,223.000