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Equity Method Investments - Summarized Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Current Assets | $ 35,604 |  | $ 35,604 |  | $ 33,570
Current liabilities | 23,946 |  | 23,946 |  | 35,082
Revenues | 142,268 | $ 137,556 | 423,306 | $ 445,382 |
Operating income | 51,765 | 34,729 | 134,688 | 96,097 |
Net Income | 46,328 | 30,530 | 118,539 | 75,112 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Red River |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Current Assets | 16,738 |  | 16,738 |  | 9,278
Non-current Assets | 413,879 |  | 413,879 |  | 381,778
Current liabilities | 9,556 |  | 9,556 |  | 8,291
Revenues | 13,919 | 19,195 | 35,888 | 45,212 |
Gross Profit | 8,189 | 14,469 | 21,251 | 28,935 |
Operating income | 8,020 | 14,318 | 20,717 | 21,461 |
Net Income | 8,022 | 14,342 | 20,768 | 27,994 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Joint Ventures [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Current Assets | 20,897 |  | 20,897 |  | 29,476
Non-current Assets | 256,420 |  | 256,420 |  | 262,300
Current liabilities | 2,660 |  | 2,660 |  | $ 6,391
Revenues | 14,227 | 14,602 | 42,412 | 33,793 |
Gross Profit | 9,634 | 9,965 | 28,468 | 20,549 |
Operating income | 9,135 | 9,428 | 26,999 | 19,052 |
Net Income | $ 9,136 | $ 9,458 | $ 27,023 | $ 19,124 |

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