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Dispositions and Acquisitions - Summary of Pro Forma Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Business Combinations [Abstract]    
Revenues $ 1,334,290 $ 2,253,368
Net loss $ (590,777) $ (555,793)
Loss per share:    
Basic $ (2.42) $ (2.28)
Diluted $ (2.42) $ (2.28)