Revenues - A Rollforward of Our Allowance for Credit Losses (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Current period bad debt provision	$ (4,613)	$ (9,185)
Accounting Standards Update [Extensible List]			us-gaap:AccountingStandardsUpdate201613Member
Trade Accounts Receivable
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	(4,797)
Current period bad debt provision	(3,151)
Write-offs	4,006
Recovery of previous write offs	(581)
Ending balance	(5,156)		$ (4,797)
Trade Accounts Receivable | Cumulative effect adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ (633)
Ending balance			$ (633)