Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies, Remediation Receivables (Details)

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Commitments and Contingencies, Remediation Receivables (Details) - Paramount refinery - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Recorded Third-Party Environmental Recoveries, Current $ 644 $ 623
Recorded Third-Party Environmental Recoveries, Noncurrent $ 2,762 $ 2,648