Restructuring (Schedule of Restructuring Reserve by Type of Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Reserve [Roll Forward]
Restructuring Reserve	$ 10,010	$ 7,410
Charges	29,503	14,998	$ 15,715
Cash payments	(21,806)	(8,509)
Non-cash adjustments	(5,303)	(3,530)
Currency translation	(93)	(359)
Restructuring Reserve	12,311	10,010	7,410
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve	9,498	6,525
Charges	23,557	11,189
Cash payments	(20,871)	(8,113)
Non-cash adjustments	12	0
Currency translation	(90)	(103)
Restructuring Reserve	12,106	9,498	6,525
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve	512	885
Charges	5,946	3,809
Cash payments	(935)	(396)
Non-cash adjustments	(5,315)	(3,530)
Currency translation	(3)	(256)
Restructuring Reserve	$ 205	$ 512	$ 885