Goodwill (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Balance at beginning of period	$ 221,334	$ 230,882
Acquisitions and adjustments		(331)
Effect of foreign currency exchange rates	1,842	(9,217)
Balance at end of period	223,176	221,334
Americas
Goodwill [Roll Forward]
Balance at beginning of period	0	0
Acquisitions and adjustments		0
Effect of foreign currency exchange rates	0	0
Balance at end of period	0	0
EMEA
Goodwill [Roll Forward]
Balance at beginning of period	184,020	191,948
Acquisitions and adjustments		(331)
Effect of foreign currency exchange rates	2,675	(7,597)
Balance at end of period	186,695	184,020
APAC
Goodwill [Roll Forward]
Balance at beginning of period	37,314	38,934
Acquisitions and adjustments		0
Effect of foreign currency exchange rates	(833)	(1,620)
Balance at end of period	$ 36,481	$ 37,314