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Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator for Basic and Diluted Earnings Per Share - [Abstract]        
Net Income (Loss) $ 23,053 $ (292,558) $ 51,570 $ (764,334)
Denominator for Basic Earnings Per Share - [Abstract]        
Weighted Average Shares 574,439 547,335 574,162 547,029
Denominator for Diluted Earnings Per Share - [Abstract]        
Adjusted Diluted Weighted Average Shares 578,483 547,335 578,573 547,029
Net Income (Loss) Per Share [Abstract]        
Basic $ 0.04 $ (0.53) $ 0.09 $ (1.40)
Diluted $ 0.04 $ (0.53) $ 0.09 $ (1.40)
Stock Options And SARs [Member]        
Potential Dilutive Common Shares - [Abstract]        
Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangments 1,452 0 1,669 0
Antidilutive Securities Excluded from Computation of Earnings Per Share [Abstract]        
Anti-dilutive Securities excluded from Diluted Earnings Per Share Calculation 3,400 10,200 2,000 10,400
Restricted Stock/Units and Performance Units/Stock [Member]        
Potential Dilutive Common Shares - [Abstract]        
Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangments 2,592 0 2,742 0
Antidilutive Securities Excluded from Computation of Earnings Per Share [Abstract]        
Anti-dilutive Securities excluded from Diluted Earnings Per Share Calculation   4,600   4,600