Revenue From Contracts with Customers - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue
Accounts receivable, trade	$ 144,865	$ 147,985
Contract with customer	11,400	17,100
Deferred revenue	36,578	36,571	$ 730
Revenue from contract liability	(42,268)	(28,428)	$ 0
Trade receivable
Disaggregation of Revenue
Accounts receivable, trade	$ 139,400	$ 142,100