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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