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Equity Method Investments - Summarized Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Current Assets | $ 26,588 |  | $ 26,588 |  | $ 29,309
Current liabilities | 88,044 |  | 88,044 |  | 28,300
Revenues | 189,627 | $ 142,268 | 511,018 | $ 423,306 |
Operating income | 50,583 | 51,765 | 141,147 | 134,688 |
Net Income | 43,624 | 46,328 | 123,137 | 118,539 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Red River |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Current Assets | 25,444 |  | 25,444 |  | 13,488
Non-current Assets | 406,051 |  | 406,051 |  | 413,259
Current liabilities | 11,786 |  | 11,786 |  | 7,789
Revenues | 19,349 | 13,919 | 46,136 | 35,888 |
Gross Profit | 12,027 | 8,189 | 26,367 | 21,251 |
Operating income | 11,871 | 8,020 | 25,866 | 20,717 |
Net Income | 11,853 | 8,022 | 25,843 | 20,768 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Joint Ventures [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Current Assets | 20,790 |  | 20,790 |  | 20,763
Non-current Assets | 245,560 |  | 245,560 |  | 253,862
Current liabilities | 3,731 |  | 3,731 |  | $ 1,496
Revenues | 12,090 | 14,227 | 35,316 | 42,412 |
Gross Profit | 6,757 | 9,634 | 20,462 | 28,468 |
Operating income | 6,300 | 9,135 | 19,022 | 26,999 |
Net Income | $ 6,300 | $ 9,136 | $ 19,023 | $ 27,023 |

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