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Revenue - Change in Contract Balances (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
USD ($)
Contract Assets  
Contract with customer, asset, net, beginning balance $ 18,656
Payments received for services billed (17,735)
Services provided and billed in current period 168,602
Payments received for services billed in current period (151,078)
Contract with customer, asset, net, ending balance 18,445
Contract Liabilities  
Contract with customer, liability, beginning balance (27,076)
Amortization of deferred commissioning period revenue 3,165
Contract with customer, liability, ending balance $ (23,911)