Schedule II - Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowances for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of Year		$ 1,200	$ 1,288	$ 2,023
Additions Charged to Expense		6,712	1,050	414
Additions Charged to Other Accounts		17	45	39
Write Offs		(2,628)	(1,182)	(1,170)
Other	[1]	9	(1)	(18)
Balance at end of Year		5,310	1,200	1,288
Deferred tax valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of Year		4,276	3,356	4,010
Additions Charged to Expense		77,369	884	1,230
Write Offs				(1,851)
Other	[1]	150	36	(33)
Balance at end of Year		$ 81,795	$ 4,276	$ 3,356

[1] “Other” primarily includes foreign exchange translation adjustments.