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Equity Method Investments - Summarized Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |
Current Assets | $ 28,091 |  | $ 29,309
Current liabilities | 32,766 |  | 28,300
Revenues | 152,913 | $ 163,401 |
Operating income | 42,170 | 35,042 |
Net Income | 36,267 | 27,796 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Red River |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Current Assets | 8,441 |  | 13,488
Non-current Assets | 410,772 |  | 413,259
Current liabilities | 10,093 |  | 7,789
Revenues | 9,043 | 10,096 |
Gross Profit | 3,625 | 5,887 |
Operating income | 3,439 | 5,697 |
Net Income | 3,439 | 5,721 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Joint Ventures [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Current Assets | 22,879 |  | 20,763
Non-current Assets | 251,121 |  | 253,862
Current liabilities | 4,995 |  | $ 1,496
Revenues | 9,626 | 15,447 |
Gross Profit | 4,966 | 10,636 |
Operating income | 4,478 | 10,140 |
Net Income | $ 4,179 | $ 10,158 |

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