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Revenue from Contracts with Customers - Revenue From Contracts With Customers Table (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Revenue from customers $ 2,745,373 $ 2,305,408  
Revenue from other than customers, other 1,468 2,125  
Total revenues and other 2,746,174 2,299,658 $ 2,429,614
Service Revenues - Fee Based [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from customers 2,388,191 1,905,728  
Service Revenues - Product Based [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from customers 70,127 88,785  
Product Sales [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from customers 287,055 310,895  
Commodity-Price Swap Agreement [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from other than customers $ (667) $ (7,875)