Allowance For Doubtful Accounts - Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Valuation and Qualifying Accounts Disclosure [Roll forward]
Balance at Beginning of Period	$ 11,716	$ 5,187	$ 5,457
Charged to Costs and Expenses	3,582	1,925	493
Write-Offs Charged to Allowance	(2,187)	(322)	(295)
Exchange Rate Changes and Other Adjustments	34	4,926	(468)
Balance at End of Period	$ 13,145	$ 11,716	$ 5,187