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Transactions with Related Parties (Schedule of Transactions With Related Parties) (Details) - Affiliated Entity - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018
CEO |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, expenses | $ 660 | $ 660 | $ 660 |  |
Sandhill Group Llc |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, revenues | 0 | 1,233 | 2,820 | [1] |
Equity investment, ownership percentage |  |  |  |  | 50.00%
Poseidon Oil Pipeline Company |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, revenues | 12,669 | 12,557 | 12,357 | [2] |
Related party transaction, expenses | $ 975 | 994 | 986 | [2] |
Equity investment, ownership percentage | 64.00% |  |  |  |
ANSAC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, revenues | $ 367,133 | 373,606 | 124,536 |  |
Related party transaction, expenses | $ 4,446 | $ 5,284 | $ 2,242 |  |
[1] | We owned a 50% interest in Sandhill Group, LLC which was sold in the third quarter of 2018.
[2] | We own a 64% interest in Poseidon Oil Pipeline Company, LLC.

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