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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]
Other Member [Member]
Balance at Dec. 31, 2013 $ 650,437 $ 1,082 $ 902,496 $ (432,074) $ (1,517) $ 180,450  
Balance, shares at Dec. 31, 2013   108,155,002          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) (41,638) $ 0 0 (53,041) 0 11,403  
Capital investment attributable to noncontrolling interest (30) 0 0 0 0 (30) $ (30)
Unrealized loss on investment available for sale $ 824 $ 0 (640) 0 1,464 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 562,234 562,234          
Stock options exercised, value $ 4,152 $ 6 4,146 0 0 0  
Award of restricted stock units (2,361) $ (5) (2,366) 0 0 0  
Award of restricted stock units, shares   559,824          
Share-based compensation costs 18,476 $ 0 18,476 0 0 0  
Stockholders' Equity, Other (191,833) 0 0 0 0 (191,833)  
Balance at Dec. 31, 2014 438,087 $ 1,093 922,112 (485,115) (53) 50  
Balance, shares at Dec. 31, 2014   109,277,060          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 47,234 $ 0 0 47,234 0 0  
Capital investment attributable to noncontrolling interest 0           0
Unrealized loss on investment available for sale $ (263) $ 0 0 0 (263) 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 $ 13 9,794 0 0 0  
Award of restricted stock units $ (3,672) $ (6) $ (3,678) $ 0 $ 0 $ 0  
Stock Issued During Period, Shares, Performance Stock Award, Net (2,446,000) 481,749 (2,451,000) 0 0 0  
Stock Issued During Period, Value, Performance Stock Award, Gross   $ (5)          
Award of restricted stock units, shares   553,822          
Share-based compensation costs $ 19,264 $ 0 $ 19,264 $ 0 $ 0 $ 0  
Balance at Dec. 31, 2015 $ 508,011 $ 1,117 945,041 (437,881) (316) 50  
Balance, shares at Dec. 31, 2015 111,614,420 111,614,420          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) $ 418,003 $ 0 0 418,003 0 0  
Capital investment attributable to noncontrolling interest 0           $ 0
Unrealized loss on investment available for sale $ (299) $ 0 0 0 (299) 0  
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 (3,368) $ (6) (3,374) 0 0 0  
Stock Issued During Period, Shares, Performance Stock Award Gross   159,027          
Stock Issued During Period, Value, Performance Stock Award, Gross (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  
Award of restricted stock units, shares   670,032          
Share-based compensation costs 15,518 $ 0 15,518 0 0 0  
Balance at Dec. 31, 2016 $ 934,126 $ 1,129 $ 953,440 $ (19,878) $ (615) $ 50  
Balance, shares at Dec. 31, 2016 112,896,377 112,896,377