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Goodwill and Other Intangibles Investment in West Atlantic (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Payments to Acquire Interest in Joint Venture $ 13,300 $ 12,300 $ 11,400
Equity Method Investments 10,700 10,900  
Goodwill $ 395,974 $ 395,974 $ 390,745