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Equity Method Investments - Summarized Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Current assets | $ 29,309 |  |  |  | $ 33,570 |  |  |  | $ 33,570 | $ 29,309 | $ 33,570 |
Current liabilities | 28,300 |  |  |  | 35,082 |  |  |  | 35,082 | 28,300 | 35,082 |
Non-current liabilities | 1,036,418 |  |  |  | 860,484 |  |  |  | 860,484 | 1,036,418 | 860,484 |
Revenues | 140,112 | $ 142,268 | $ 117,637 | $ 163,401 | 138,610 | $ 137,556 | $ 155,342 | $ 152,483 |  | 563,418 | 583,992 | $ 657,609
Operating income | 45,105 | $ 51,765 | $ 47,881 | $ 35,042 | 29,715 | $ 34,729 | $ 32,256 | $ 29,111 |  | 179,793 | 125,812 | 125,757
Net income attributable to partners |  |  |  |  |  |  |  |  |  | 159,256 | 96,749 | 90,182
Red River | Red River |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Current assets | 13,488 |  |  |  | 9,278 |  |  |  | 9,278 | 13,488 | 9,278 |
Non-current assets | 413,259 |  |  |  | 381,778 |  |  |  | 381,778 | 413,259 | 381,778 |
Current liabilities | 7,789 |  |  |  | 8,291 |  |  |  | 8,291 | 7,789 | 8,291 |
Revenues |  |  |  |  |  |  |  |  | 38,352 | 51,001 |  |
Red River | Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 25,919 | 31,103 |  |
Operating income |  |  |  |  |  |  |  |  | 25,497 | 30,382 |  |
Net income attributable to partners |  |  |  |  |  |  |  |  | 25,548 | 30,404 |  |
Joint Ventures | Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Current assets | 20,763 |  |  |  | 29,476 |  |  |  | 29,476 | 20,763 | 29,476 |
Non-current assets | 253,862 |  |  |  | 262,300 |  |  |  | 262,300 | 253,862 | 262,300 |
Current liabilities | 1,496 |  |  |  | 6,391 |  |  |  | 6,391 | 1,496 | 6,391 |
Non-current liabilities | $ 0 |  |  |  | $ 8 |  |  |  | $ 8 | 0 | 8 |
Revenues |  |  |  |  |  |  |  |  |  | 55,482 | 48,703 | 35,050
Gross profit |  |  |  |  |  |  |  |  |  | 36,904 | 30,473 | 17,690
Operating income |  |  |  |  |  |  |  |  |  | 34,951 | 28,503 | 12,909
Net income attributable to partners |  |  |  |  |  |  |  |  |  | $ 34,977 | $ 28,601 | $ 15,701

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