Revenue from Contract with Customers - Contract Balances (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Disaggregation of Revenue
Accounts receivable, trade	$ 113,607		$ 144,865
Contract liability with customer	4,900		11,400
Deferred revenue recognized in earnings	17,183	$ 33,538
Deferred revenue	10,696	$ 27,390
Contract with Customers
Disaggregation of Revenue
Accounts receivable, trade	$ 102,800		$ 139,400