Credit Losses - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 57,730
Provision for expected credit losses	36,359	$ 5,370
Write-offs	(3,945)
Other	2,743
Ending balance	102,755
Cumulative-effect adjustment upon adoption
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 9,868