Restructuring (Narrative) (Details) $ in Thousands		1 Months Ended	3 Months Ended			6 Months Ended	9 Months Ended
	Nov. 17, 2015 position	Dec. 31, 2015 position	Sep. 30, 2016 USD ($)	Mar. 31, 2016 position	Sep. 30, 2015 USD ($)	Jun. 30, 2015 position	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring			$ 12,061		$ 13,766		$ 62,142	$ 62,251
2015 Other Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Number of full-time positions eliminated | position	700	350		350
Restructuring			4,400				47,700
Restructuring costs incurred since inception			77,400				77,400
2015 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Number of full-time positions eliminated | position						700
Restructuring			7,600				14,600
Restructuring costs incurred since inception			$ 83,500				$ 83,500