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Investment in Unconsolidated Entities - Cash Received and Distributions from Joint Venture (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]      
Net change in cash and cash equivalents $ (2,785) $ (8,918) $ 5,959
Torrance Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Cash generated from other activities and excess cash 0 0  
Net change in cash and cash equivalents   0  
NewINK Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Cash generated from other activities and excess cash 2,518 4,728  
Net change in cash and cash equivalents 2,518 4,728  
Inland Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Cash generated from other activities and excess cash 700 2,500  
Net change in cash and cash equivalents $ 700 $ 2,500