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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 84,160 $ 0 0 84,160 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 1,106 $ 0 0 0 1,106 0
Stock options exercised   151,683        
Stock options exercised 1,227 $ 1 1,226 0 0 0
Release of restricted stock units, net of tax   150,945        
Release of restricted stock units, net of tax (2,232) $ 1 (2,233) 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   (441,586)        
Stock Repurchased and Retired During Period, Value (11,090) $ (4) (11,086) 0 0 0
Dividends, Cash (5,653) 0 0 (5,653) 0 0
Share-based compensation costs 8,830 0 8,830 0 0 0
Noncontrolling Interest, Decrease from Deconsolidation 50         (50)
Balances at Jun. 30, 2017 1,020,464 $ 1,129 948,384 70,460 491 0
Balance, shares at Jun. 30, 2017   112,931,072.000        
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 $ 80,344 $ 0 0 80,344 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 (1,270) $ 0 0 0 (1,270) 0
Stock options exercised   241,236        
Stock options exercised 2,253 $ 2 2,251 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   (859,808)        
Stock Repurchased and Retired During Period, Value (30,332) $ (8) (30,324) 0 0 0
Dividends, Cash (12,377) 0 0 (12,377) 0 0
Share-based compensation costs 14,949 0 14,949 0 0 0
Balances at Jun. 30, 2018 $ 1,145,160 $ 1,124 $ 913,096 $ 232,080 $ (1,140) $ 0
Balance, shares at Jun. 30, 2018 112,370,340 112,370,340.00