Revenue and Accounts Receivable - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Allowance for Credit Losses [Roll Forward]
Beginning Balance(1)	$ 6,895	$ 7,551	$ 7,881	$ 6,037
Accounts Receivable, Credit Loss Expense (Reversal)	4,857	397	5,331	1,750
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	(627)	(589)	(3,397)	(428)
Ending Balance	$ 11,125	$ 7,359	11,125	$ 7,359
Accounting Standards Update 2016-13 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax			$ 1,310