Restructuring (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Oct. 04, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 8,552	$ 12,176	$ 18,678	$ 61,312
Operational Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	1,700		9,200
Restructuring costs incurred since inception	$ 9,200		$ 9,200
Minimum [Member] | Subsequent Event [Member]
Restructuring Cost and Reserve [Line Items]
Total expected cost					$ 60,000
Maximum [Member] | Subsequent Event [Member]
Restructuring Cost and Reserve [Line Items]
Total expected cost					100,000
Employee Severance [Member] | Minimum [Member] | Subsequent Event [Member]
Restructuring Cost and Reserve [Line Items]
Total expected cost					55,000
Employee Severance [Member] | Maximum [Member] | Subsequent Event [Member]
Restructuring Cost and Reserve [Line Items]
Total expected cost					70,000
Consolidation of Leased Facilities and Other Restructuring [Member] | Minimum [Member] | Subsequent Event [Member]
Restructuring Cost and Reserve [Line Items]
Total expected cost					5,000
Consolidation of Leased Facilities and Other Restructuring [Member] | Maximum [Member] | Subsequent Event [Member]
Restructuring Cost and Reserve [Line Items]
Total expected cost					$ 30,000