Quarterly report pursuant to Section 13 or 15(d)

Leased Properties - Portland Terminal Facility (Details)

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Leased Properties - Portland Terminal Facility (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Portland Terminal Facility [Member]    
Sale Leaseback Transaction [Line Items]    
Estimated useful lives of assets 30 years  
Depreciation $ 319 $ 407
Portland Terminal Facility [Member]    
Sale Leaseback Transaction [Line Items]    
Construction and Development Costs $ 10,000