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Related-Party Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Information on related party transaction      
Receivables from related parties $ 5,435 $ 3,773  
GPC      
Information on related party transaction      
Receivables from related parties $ 23 7  
GPC | GPC Amended and Restated Services Agreement [Member]      
Related Party Transactions      
Notice period to terminate the receipt of services under the agreement 90 days    
General Partner, Global GP LLC      
Information on related party transaction      
Expenses incurred from transactions with related parties $ 104,800 106,000 $ 101,600
Receivables from related parties $ 5,412 $ 3,766  
GPC | Slifka Family [Member]      
Related Party Transactions      
Ownership interest, as a percent 100.00%