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Related-Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Information on related party transaction          
Receivables from related parties $ 7,496   $ 7,496   $ 7,823
GPC          
Related Party Transactions          
Notice period to terminate the receipt of services under the agreement     90 days    
Information on related party transaction          
Receivables from related parties 25   $ 25   53
General Partner, Global GP LLC          
Information on related party transaction          
Expenses incurred from transactions with related parties 42,400 $ 28,800 70,200 $ 58,000  
Receivables from related parties $ 7,471   $ 7,471   $ 7,770
GPC | Slifka Family [Member]          
Related Party Transactions          
Ownership interest, as a percent 100.00%   100.00%