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Other Long-term Liabilities, Contingent Consideration (Details) - USD ($)
3 Months Ended 4 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2017
Mar. 01, 2017
Other Liabilities Noncurrent [Line Items]        
Change in fair value of contingent liability     $ 1,200,000  
Permian Acquisition [Member]        
Other Liabilities Noncurrent [Line Items]        
Additional cash paid in potential earn-out payment $ 417,400,000 $ 417,400,000 417,400,000 $ 461,600,000
Contingent consideration valuation 461,600,000 461,600,000 461,600,000 416,300,000
Decreased preliminary acquisition date fair value of potential earn-out payment 416,300,000      
Change in fair value of contingent liability   1,100,000 1,100,000  
Fair value of first potential earn-out payment 40,600,000 40,600,000 40,600,000  
Fair value of second potential earn-out payment 376,800,000 376,800,000 376,800,000  
Permian Acquisition [Member] | Maximum [Member]        
Other Liabilities Noncurrent [Line Items]        
Additional cash paid in potential earn-out payment $ 935,000,000 $ 935,000,000 $ 935,000,000 $ 935,000,000