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Consolidated Statement of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings/(Accumulated Deficit)
Accumulated Other Comprehensive Loss, Net
Noncontrolling Interest [Member]
Balance at Dec. 31, 2015 $ 501,837 $ 1,117 $ 945,041 $ (444,055) $ (316) $ 50
Balance, shares at Dec. 31, 2015   111,614,420        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 420,231 $ 0 0 420,231 0 0
Other Comprehensive Income (Loss), Net of Tax (299) $ 0 0 0 (299) 0
Unrealized loss on investment available for sale $ (299)          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 452,898 452,898        
Stock options exercised, value $ 2,940 $ 4 2,936 0 0 0
Award of restricted stock units, shares   670,032        
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures (3,368) $ 6 (3,374) 0 0 0
Stock Issued During Period, Shares, Performance Stock Award, Net   159,027        
Stock Issued During Period, Values, Performance Stock Award, Net (867) $ 2 (869) 0 0 0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation 5,812 0 5,812 0 0 0
Stock Repurchased and Retired During Period, Value 0          
Share-based compensation costs 15,518 0 15,518 0 0 0
Balance 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]            
Cumulative Effect of New Accounting Principle in Period of Adoption 15,777 $ 0 0 15,777 0 0
Net income (loss) 189,390 0 0 189,390 0 0
Other Comprehensive Income (Loss), Net of Tax 433 $ 0 0 0 433 0
Unrealized loss on investment available for sale $ 433          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 241,964 241,964        
Stock options exercised, value $ 2,084 $ 2 2,082 0 0 0
Award of restricted stock units, shares   520,854        
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures (8,004) $ 5 (8,009) 0 0 0
Stock Issued During Period, Shares, Performance Stock Award, Net   173,653        
Stock Issued During Period, Values, Performance Stock Award, Net (1,791) $ 2 (1,793) 0 0 0
Dividends, Cash $ (16,918) $ 0 0 (16,918) 0 0
Stock Repurchased and Retired During Period, Shares 1,198,000 (1,198,430)        
Stock Repurchased and Retired During Period, Value $ (31,927) $ (12) (31,915) 0 0 0
Share-based compensation costs 17,413 0 17,413 0 0 0
Noncontrolling Interest, Decrease from Deconsolidation 590 0 640 0 0 (50)
Balance 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]            
Cumulative Effect of New Accounting Principle in Period of Adoption $ 0 $ 0 0 (312) 312 0
Net income (loss) 115,048 0 0 115,048 0 0
Other Comprehensive Income (Loss), Net of Tax (1,195) $ 0 0 0 (1,195) 0
Unrealized loss on investment available for sale $ (1,195)          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 338,426 338,426        
Stock options exercised, value $ 3,542 $ 3 3,539 0 0 0
Award of restricted stock units, shares   300,177        
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures (3,616) $ 3 (3,619) 0 0 0
Stock Issued During Period, Shares, Performance Stock Award, Net   337,537        
Stock Issued During Period, Values, Performance Stock Award, Net (5,270) $ 4 (5,274) 0 0 0
Dividends, Cash $ (25,804) $ 0 0 (25,804) 0 0
Stock Repurchased and Retired During Period, Shares 1,853,000 (1,853,453)        
Stock Repurchased and Retired During Period, Value $ (59,570) $ (18) (59,552) 0 0 0
Share-based compensation costs 25,379 0 25,379 0 0 0
Balance at Dec. 31, 2018 $ 1,145,741 $ 1,118 $ 892,331 $ 253,357 $ (1,065) $ 0
Balance, shares at Dec. 31, 2018 111,757,105 111,757,105