Equity Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020		Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (15,118)	$ (8,951)	$ (9,913)	$ (15,533)	$ (23,178)	$ (28,912)	$ (15,118)	$ (15,533)	$ (1,522)	[1]	$ (15,402)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(5,431)	1,649	(7,752)	7,607	5,568	(12,984)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(736)	(687)	(639)	38	166	(526)
Other Comprehensive income (loss), net of Tax	(6,167)	962	(8,391)	7,645	5,734	(13,510)	(13,596)	(131)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(15,897)	(10,537)	(11,839)	(16,557)	(23,183)	(27,787)	(15,897)	(16,557)	(4,381)		(17,310)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(5,360)	1,302	(7,458)	6,626	4,604	(10,477)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0	0	0	0
Other Comprehensive income (loss), net of Tax	(5,360)	1,302	(7,458)	6,626	4,604	(10,477)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	668	1,487	1,839	1,070	54	(1,072)	668	1,070	2,784		1,880
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(83)	335	(306)	978	960	(2,426)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(736)	(687)	(639)	38	166	(526)
Other Comprehensive income (loss), net of Tax	(819)	(352)	(945)	1,016	1,126	(2,952)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	111	99	87	(46)	(49)	(53)	$ 111	$ (46)	$ 75		$ 28
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	12	12	12	3	4	(81)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0	0	0	0
Other Comprehensive income (loss), net of Tax	$ 12	$ 12		$ 3	$ 4	$ (81)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent			$ 12

[1] December 31, 2020 balances were derived from audited consolidated financial statements.