Revenues - A Rollforward of Our Allowance for Credit Losses (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Current period bad debt provision	$ (3,733)	$ (6,015)
Accounting Standards Update [Extensible List]			us-gaap:AccountingStandardsUpdate201613Member
Trade Accounts Receivable
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balancee	(4,797)
Current period bad debt provision	(3,134)
Write-offs	2,707
Recovery of previous write offs	(442)
Ending balance	(6,299)		$ (4,797)
Trade Accounts Receivable | Cumulative effect adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balancee	$ 633
Ending balance			$ 633