Annual report pursuant to Section 13 and 15(d)

Fair Value - Joliet (Details)

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Fair Value - Joliet (Details) - Zenith Terminal Joliet Holdings
$ in Thousands
Dec. 21, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Equity interest percentage 0.60%
Sale of investment $ 446