Restructuring (Narrative) (Details) $ in Thousands		1 Months Ended	3 Months Ended			6 Months Ended
	Nov. 17, 2015 position	Dec. 31, 2015 position	Jun. 30, 2016 USD ($)	Mar. 31, 2016 position	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) position	Jun. 30, 2015 USD ($) position
Restructuring Cost and Reserve [Line Items]
Restructuring			$ 4,016		$ 14,534	$ 50,081	$ 48,485
2015 Other Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Number of full-time positions eliminated | position	700	350		350
Restructuring			4,200			43,200
Restructuring costs incurred since inception			73,000			73,000
2015 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Number of full-time positions eliminated | position							700
Restructuring						7,000
Restructuring costs incurred since inception			75,900			$ 75,900
2014 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Number of full-time positions eliminated | position						325
Restructuring costs incurred since inception			$ 22,000			$ 22,000