Goodwill (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Balance at beginning of period	$ 223,176	$ 221,334
Dispositions and impairments	(74,384)
Effect of foreign currency exchange rates	12,973	1,842
Balance at end of period	161,765	223,176
Americas
Goodwill [Roll Forward]
Balance at beginning of period	0	0
Dispositions and impairments	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	186,695	184,020
Dispositions and impairments	(69,685)
Effect of foreign currency exchange rates	10,582	2,675
Balance at end of period	127,592	186,695
APAC
Goodwill [Roll Forward]
Balance at beginning of period	36,481	37,314
Dispositions and impairments	(4,699)
Effect of foreign currency exchange rates	2,391	(833)
Balance at end of period	34,173	$ 36,481
Discontinued Operations, Held-for-sale or Disposed of by Sale | GIBBSCam Cimatron
Goodwill [Roll Forward]
Balance at end of period	21,385
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Australia ODM
Goodwill [Roll Forward]
Balance at end of period	$ 4,699