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Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - 6 months ended Jun. 30, 2016 - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in-Capital [Member]
Retained Earnings [Member]
Balance, shares at Dec. 31, 2015   139,076 508    
Balance at Dec. 31, 2015 $ 2,319,342 $ 1,376 $ (13,620) $ 1,497,065 $ 834,521
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock, shares   39,100      
Issuance of common stock 182,953 $ 391   182,562  
Stock-based compensation, shares   2,517      
Stock-based compensation 13,966     13,966  
Vesting of restricted shares 0 $ 10   (10)  
Treasury stock - tax withholdings, shares   (294) 294    
Treasury stock – tax withholdings (1,520)   $ (1,520)    
Net loss (154,386)       (154,386)
Balance, shares at Jun. 30, 2016   180,399 802    
Balance at Jun. 30, 2016 $ 2,360,355 $ 1,777 $ (15,140) $ 1,693,583 $ 680,135