Stockholders' Equity Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (1,522)	$ (15,402)	$ (16,945)	$ (14,959)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	14,481	2,239	(1,421)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(601)	(696)	(565)
Other Comprehensive Income (Loss), Net of Tax	13,880	1,543	(1,986)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(4,381)	(17,310)	(17,682)	(14,578)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	12,929	372	(3,104)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0
Other Comprehensive Income (Loss), Net of Tax	12,929	372	(3,104)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	2,784	1,880	638	(365)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	1,505	1,938	1,568
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(601)	(696)	(565)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	904	1,242	1,003
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	75	28	99	$ (16)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	47	(71)	115
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0
Other Comprehensive Income (Loss), Net of Tax	$ 47	$ (71)	$ 115