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Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2017
Mar. 31, 2018
Oct. 31, 2017
Business Acquisition [Line Items]      
Step Acquisition, Equity Interest in Acquiree $ 112,000    
Step Acquisition - Remeasurement Gain 36,300    
Consideration Transferred $ 363,800    
Business Acquisition Purchase Price     $ 250,000
Working Capital Adjustment   $ 1,800  
Assets Acquired - Cash and Equivalents     4,609
Assets Acquired - Receivables     4,919
Assets Acquired - Prepaid and other Current Assets     253
Assets Acquired - Properties and Equipment     277,016
Assets Acquired - Intangible Assets     70,182
Goodwill     11,615
Liabilities Assumed - Accounts Payable     (3,311)
Liabilities Assumed - Accrued Property Taxes     (1,438)
Liabilities Assumed - Other Current Liabilities     (65)
Net Assets Acquired     $ 363,780
SLC Pipeline [Member]      
Business Acquisition [Line Items]      
Equity Method Investment, Ownership Percentage 75.00%    
Frontier Pipeline [Member]      
Business Acquisition [Line Items]      
Equity Method Investment, Ownership Percentage 50.00% 50.00%