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Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - 3 months ended Mar. 31, 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 183,164 $ 391   182,773  
Stock-based compensation, shares   2,614      
Stock-based compensation 7,430     7,430  
Vesting of restricted shares 0 $ 7   (7)  
Treasury stock - tax withholdings, shares   (207) 207    
Treasury stock – tax withholdings (1,032)   $ (1,032)    
Net loss (64,455)       (64,455)
Balance, shares at Mar. 31, 2016   180,583 715    
Balance at Mar. 31, 2016 $ 2,444,449 $ 1,774 $ (14,652) $ 1,687,261 $ 770,066