Restructuring (Schedule of Restructuring Reserve by Type of Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Reserve [Roll Forward]
Balance at December 31, 2016			$ 12,311
Charges (credits)	$ (81)	$ 389	2,623	$ 354
Cash payments			(13,547)
Non-cash adjustments			16
Currency translation			10
Balance at June 30, 2017	1,413		1,413
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Balance at December 31, 2016			12,106
Charges (credits)			2,636
Cash payments			(13,396)
Non-cash adjustments			(52)
Currency translation			1
Balance at June 30, 2017	1,295		1,295
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Balance at December 31, 2016			205
Charges (credits)			(13)
Cash payments			(151)
Non-cash adjustments			68
Currency translation			9
Balance at June 30, 2017	$ 118		$ 118