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Equity Method Investments (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 28, 2018
terminal
Mar. 31, 2018
USD ($)
joint_venture
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]        
Equity method investments, number of joint ventures | joint_venture   2    
Investment in joint ventures   $ 105,630   $ 106,465
CP LLC        
Schedule of Equity Method Investments [Line Items]        
Ownership interest (as percent)   50.00%    
Rangeland Rio        
Schedule of Equity Method Investments [Line Items]        
Ownership interest (as percent)   33.00%    
Joint Ventures        
Schedule of Equity Method Investments [Line Items]        
Current assets   $ 13,226   12,671
Non-current assets   242,851   244,329
Current liabilities   2,227   1,798
Non-current liabilities   0   $ 0
Revenues   7,990 $ 5,671  
Gross profit   7,990 5,671  
Net income   $ 2,712 $ 1,013  
DKGP Energy Terminals, LLC        
Schedule of Equity Method Investments [Line Items]        
Ownership interest (as percent) 50.00%      
Equity method investment, number of terminals acquired | terminal 2      
Equity method investment, terminals managed under joint venture agreement | terminal 4