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Equity Method Investments - Summarized Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Current Assets | $ 23,126 |  | $ 23,126 |  | $ 29,309
Current liabilities | 67,527 |  | 67,527 |  | 28,300
Revenues | 168,478 | $ 117,637 | 321,391 | $ 281,038 |
Operating income | 48,394 | 47,881 | 90,564 | 82,923 |
Net Income | 43,246 | 44,415 | 79,513 | 72,211 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Red River |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Current Assets | 21,877 |  | 21,877 |  | 13,488
Non-current Assets | 408,375 |  | 408,375 |  | 413,259
Current liabilities | 11,211 |  | 11,211 |  | 7,789
Revenues | 17,744 | 11,873 | 26,787 | 21,969 |
Gross Profit | 10,715 | 7,175 | 14,340 | 13,062 |
Operating income | 10,556 | 7,000 | 13,995 | 12,697 |
Net Income | 10,551 | 7,025 | 13,990 | 12,746 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Joint Ventures [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Current Assets | 20,551 |  | 20,551 |  | 20,763
Non-current Assets | 248,340 |  | 248,340 |  | 253,862
Current liabilities | 2,825 |  | 2,825 |  | $ 1,496
Revenues | 13,600 | 12,738 | 23,226 | 28,185 |
Gross Profit | 8,739 | 8,198 | 13,705 | 18,834 |
Operating income | 8,244 | 7,724 | 12,722 | 17,864 |
Net Income | $ 8,544 | $ 7,729 | $ 12,723 | $ 17,887 |

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