Revenue Recognition - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jan. 01, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 23,777	$ 16,604
Credit losses	12,253	22,031
Deductions	(15,367)	(13,979)
Foreign currency translation	(1,262)	596
Balance at end of period	19,401	$ 25,252
Accumulated earnings (losses)	$ 583,474			$ 632,809
Accounting Standards Update 2016-13
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Other current assets and other non-current assets			$ 13,400
Accumulated earnings (losses)			$ 2,900