v3.19.2
Investments in Non-Controlled Entities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]          
Revenues $ 701,699 $ 644,091 $ 1,330,634 $ 1,322,870  
Operating 168,929 159,845 314,954 303,141  
Cost of product sales 152,876 153,679 321,970 353,271  
Trade accounts receivable 139,611   139,611   $ 104,164
Other accounts receivable 25,317   25,317   25,007
Long-term receivables 21,304   21,304   20,844
Change in Equity Method Investments [Roll Forward]          
Investments at December 31, 2018     1,076,306    
Additional investment     112,251    
Indemnification settlement     (5,000)    
Proportionate share of earnings     72,968    
Amortization of excess investment and capitalized interest     (928)    
Earnings of non-controlled entities 40,785 42,510 72,040 77,048  
Distributions from operations of non-controlled entities     83,069 94,661  
Distributions from returns of investments in non-controlled entities     7,500 0  
Investments at June 30, 2019 1,165,028   1,165,028    
Service [Member]          
Schedule of Equity Method Investments [Line Items]          
Revenues 506,405 472,248 967,197 904,185  
Product [Member]          
Schedule of Equity Method Investments [Line Items]          
Revenues 189,989 166,797 352,984 408,389  
Equity Method Investee [Member]          
Schedule of Equity Method Investments [Line Items]          
Related Party Transaction, Other Revenues from Transactions with Related Party $ 1,100 1,200 $ 2,600 1,700  
BridgeTex [Member]          
Schedule of Equity Method Investments [Line Items]          
Interest in equity method investment 30.00%   30.00%    
BridgeTex [Member] | Equity Method Investee [Member]          
Schedule of Equity Method Investments [Line Items]          
Trade accounts receivable         318
Other accounts receivable $ 31   $ 31   1,549
Other Accounts Payable 530   530    
BridgeTex [Member] | Equity Method Investee [Member] | Service [Member]          
Schedule of Equity Method Investments [Line Items]          
Revenues $ 10,181 9,697 $ 20,326 19,561  
Double Eagle Pipeline Llc [Member]          
Schedule of Equity Method Investments [Line Items]          
Interest in equity method investment 50.00%   50.00%    
Double Eagle Pipeline Llc [Member] | Equity Method Investee [Member]          
Schedule of Equity Method Investments [Line Items]          
Trade accounts receivable $ 569   $ 569   546
Double Eagle Pipeline Llc [Member] | Equity Method Investee [Member] | Service [Member]          
Schedule of Equity Method Investments [Line Items]          
Revenues $ 1,572 1,343 $ 3,231 2,887  
HoustonLink Pipeline Company LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Interest in equity method investment 50.00%   50.00%    
MVP Terminalling, LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Interest in equity method investment 50.00%   50.00%    
MVP Terminalling, LLC [Member] | Equity Method Investee [Member]          
Schedule of Equity Method Investments [Line Items]          
Other accounts receivable $ 387   $ 387   397
Powder Springs Logistics, LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Interest in equity method investment 50.00%   50.00%    
Powder Springs Logistics, LLC [Member] | Equity Method Investee [Member]          
Schedule of Equity Method Investments [Line Items]          
Cost of product sales $ 0 410 $ 0 410  
Trade accounts receivable 144   144    
Other accounts receivable 5   5    
Long-term receivables 3,824   3,824   2,221
Powder Springs Logistics, LLC [Member] | Equity Method Investee [Member] | Product [Member]          
Schedule of Equity Method Investments [Line Items]          
Revenues $ 0 2,180 $ 0 4,899  
Saddlehorn Pipeline Company [Member]          
Schedule of Equity Method Investments [Line Items]          
Interest in equity method investment 40.00%   40.00%    
Saddlehorn Pipeline Company [Member] | Equity Method Investee [Member]          
Schedule of Equity Method Investments [Line Items]          
Trade accounts receivable $ 184   $ 184    
Other accounts receivable 123   123   183
Saddlehorn Pipeline Company [Member] | Equity Method Investee [Member] | Service [Member]          
Schedule of Equity Method Investments [Line Items]          
Revenues $ 551 538 $ 1,103 1,076  
Seabrook Logistics, LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Interest in equity method investment 50.00%   50.00%    
Seabrook Logistics, LLC [Member] | Equity Method Investee [Member]          
Schedule of Equity Method Investments [Line Items]          
Operating $ 6,241 $ 0 $ 13,150 $ 0  
Other accounts receivable 252   252    
Other Accounts Payable $ 1,195   $ 1,195   $ 1,140
Texas Frontera Llc [Member]          
Schedule of Equity Method Investments [Line Items]          
Interest in equity method investment 50.00%   50.00%