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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, 2012 $ 467,127 $ 869 $ 655,694 $ (351,810) $ (962) $ 163,336  
Balance, shares at Dec. 31, 2012   86,871,977          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) (108,554) $ 0 0 (80,264) 0 (28,290)  
Capital investment attributable to noncontrolling interest 0         0 $ 0
Unrealized loss on investment available for sale (555) 0 0 0 (555) 0  
Stock Issued During Period, Value, New Issues $ 216,467 $ 190 216,277 0 0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 1,848,222 1,848,222          
Stock options exercised, value $ 13,752 $ 18 13,734 0 0 0  
Stock options exercised, shares 18,975,000            
Award of restricted stock units $ (2,095) $ 5 (2,100) 0 0 0  
Award of restricted stock units, shares   459,803          
Share-based compensation costs 18,891 $ 0 18,891 0 0 0  
Stockholders' Equity, Other 45,404 0 0 0 0 45,404  
Balance at Dec. 31, 2013 650,437 $ 1,082 902,496 (432,074) (1,517) 180,450  
Balance, shares at Dec. 31, 2013   108,155,002.000          
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 0 (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  
Stock options exercised, shares 18,975,000            
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 109,277,060 109,277,060          
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 $ 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 Gross   481,749          
Stock Issued During Period, Value, Performance Stock Award, Gross (2,446) $ 5 (2,451) 0 0 0  
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