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Investment in Unconsolidated Entities - Cash Received and Distributions from Joint Venture (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]      
Net change in cash and cash equivalents $ (8,918) $ 5,959 $ 10,856
Torrance Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Cash generated from other activities and excess cash 0 185  
Net change in cash and cash equivalents   185  
NewINK Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Cash generated from other activities and excess cash 4,728 5,884  
Net change in cash and cash equivalents 4,728 5,884  
Inland Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Cash generated from other activities and excess cash 2,500 2,845  
Net change in cash and cash equivalents $ 2,500 $ 2,845