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Consolidated Statement of Changes in Stockholders' Equity - USD ($)
Total
Common Stock
Additional Paid-in Capital
Retained Earnings/(Accumulated Deficit)
Accumulated Other Comprehensive Loss, Net
Noncontrolling Interest [Member]
Balance at Dec. 31, 2014 $ 438,087,000 $ 1,093,000 $ 922,112,000 $ (485,115,000) $ (53,000) $ 50,000
Balance, shares at Dec. 31, 2014   109,277,060        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 47,234,000 $ 0 0 47,234,000 0 0
Unrealized loss on investment available for sale $ (263,000) $ 0 0 0 (263,000) 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 1,301,789 1,301,789        
Stock options exercised, value $ 9,807,000 $ 13,000 9,794,000 0 0 0
Award of restricted stock units, shares   553,822        
Award of restricted stock units (3,672,000) $ (6,000) 3,678,000 0 0 0
Stock Issued During Period, Shares, Performance Stock Award, Net   481,749        
Stock Issued During Period, Values, Performance Stock Award, Net (2,446,000) $ 5,000 (2,451,000) 0 0 0
Stock Repurchased and Retired During Period, Value 0          
Share-based compensation costs 19,264,000 0 (19,264,000) 0 0 0
Net Income (Loss) Attributable to Parent 47,234,000          
Balance at Dec. 31, 2015 508,011,000 $ 1,117,000 945,041,000 (437,881,000) (316,000) 50,000
Balance, shares at Dec. 31, 2015   111,614,420        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 418,003,000 $ 0 0 418,003,000 0 0
Unrealized loss on investment available for sale $ (299,000) $ 0 0 0 (299,000) 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 452,898 452,898        
Stock options exercised, value $ 2,940,000 $ 4,000 2,936,000 0 0 0
Award of restricted stock units, shares   670,032        
Award of restricted stock units (3,368,000) $ (6,000) (3,374,000) 0 0 0
Stock Issued During Period, Shares, Performance Stock Award, Net   159,027        
Stock Issued During Period, Values, Performance Stock Award, Net (867,000) $ 2,000 (869,000) 0 0 0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation (5,812,000) 0 5,812,000 0 0 0
Stock Repurchased and Retired During Period, Value 0          
Share-based compensation costs 15,518,000 0 15,518,000 0 0 0
Net Income (Loss) Attributable to Parent 418,003,000          
Balance at Dec. 31, 2016 $ 934,126,000 $ 1,129,000 953,440,000 (19,878,000) (615,000) 50,000
Balance, shares at Dec. 31, 2016 112,896,377 112,896,377        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative Effect of New Accounting Principle in Period of Adoption $ 15,777,000 $ 0 0 15,777,000 0 0
Net income (loss) 189,193,000 0 0 189,193,000 0 0
Unrealized loss on investment available for sale $ 433,000 $ 0 0 0 433,000 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 241,964 241,964        
Stock options exercised, value $ 2,084,000 $ 2,000 2,082,000 0 0 0
Award of restricted stock units, shares   520,854        
Award of restricted stock units (8,004,000) $ (5,000) (8,009,000) 0 0 0
Stock Issued During Period, Shares, Performance Stock Award, Net   173,653        
Stock Issued During Period, Values, Performance Stock Award, Net 1,791,000 $ 2,000 1,793,000 0 0 0
Dividends, Cash $ (16,918,000) $ 0 0 (16,918,000) 0 0
Stock Repurchased and Retired During Period, Shares 1,198,000 (1,198,430)        
Stock Repurchased and Retired During Period, Value $ (31,927,000) $ (12,000) (31,915,000) 0 0 0
Share-based compensation costs 17,413,000 0 17,413,000 0 0 0
Net Income (Loss) Attributable to Parent 189,193,000 0 640,000 0 0  
Noncontrolling Interest, Decrease from Deconsolidation 590,000         (50,000)
Balance at Dec. 31, 2017 $ 1,100,976,000 $ 1,126,000 $ 931,858,000 $ 168,174,000 $ (182,000) $ 0
Balance, shares at Dec. 31, 2017 112,634,418 112,634,418