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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