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Contract Cost Assets (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]          
Contract cost assets $ 47,938,000   $ 47,938,000   $ 50,719,000
Impairment of contract cost assets 0 $ 0 0 $ 0  
Capitalized contract cost, amortization $ 10,100,000 $ 8,700,000 $ 20,188,000 $ 17,070,000