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Revenue from Contracts with Customers Revenue from Contracts with Customers - Amortized and Capitalized Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Capitalized Contract Cost [Roll Forward]        
Beginning Balance $ 12,780 $ 10,476 $ 11,005 $ 10,091
Contract payments 2,195 1,840 6,128 4,996
Contract amortization (1,013) (1,399) (3,171) (4,170)
Ending Balance $ 13,962 $ 10,917 $ 13,962 $ 10,917