Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020	Jan. 01, 2018
Allowance for doubtful accounts receivable
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 28,756	$ 27,678	$ 23,682
Charged to Expenses	4,200	9,868	11,914
Deductions	(7,906)	(8,687)	(8,690)
Translation Adjustments	(120)	(103)	772
Balance at End of Period	19,617	28,756	27,678
Liability recognized in accordance with ASC 606	(19,617)	(28,756)	(27,678)	$ (23,443)
Allowance for doubtful accounts receivable | Accounting Standards Update 2014-09
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Liability recognized in accordance with ASC 606					$ 9,500
Deferred tax valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	21,618	23,072	20,178
Charged to Expenses	3,462	719	5,683
Deductions	(2,333)	(2,154)	(2,599)
Translation Adjustments	1,385	(19)	(190)
Balance at End of Period	24,132	21,618	23,072
Liability recognized in accordance with ASC 606	$ (24,132)	$ (21,618)	$ (23,072)