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Transactions with Related Parties (Schedule of Transactions with Related Parties) (Details) - Affiliated Entity - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
CEO |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Costs and expenses | $ 165 | $ 165 | $ 330 | $ 330
Poseidon |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues | 3,242 | 3,035 | 7,028 | 6,182
Costs and expenses | $ 238 | 249 | $ 478 | 503
Equity method investment, ownership percentage | 64.00% |  | 64.00% |
ANSAC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues | $ 71,329 | 48,695 | $ 139,284 | 121,774
Costs and expenses | $ 519 | $ 629 | $ 697 | $ 1,461

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