Restructuring and Acquisition Charges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4,919	$ 6,820	$ 14,689	$ 32,376
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			31,377	31,957
Restructuring charges	4,919	6,820	14,689	32,376
Fixed asset disposals				(1,799)
Payments made			(27,016)	(32,722)
Restructuring reserve, ending balance	19,050	29,812	19,050	29,812
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			9,124	4,227
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			9,991	11,712
Restructuring charges			9,124	4,227
Fixed asset disposals				0
Payments made			(10,952)	(11,209)
Restructuring reserve, ending balance	8,163	4,730	8,163	4,730
Retention Bonuses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			799	7,552
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			5,188	7,555
Restructuring charges			799	7,552
Fixed asset disposals				0
Payments made			(5,524)	(6,465)
Restructuring reserve, ending balance	463	8,642	463	8,642
Lease Exit [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			(1,351)	8,227
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			11,963	7,912
Restructuring charges			(1,351)	8,227
Fixed asset disposals				0
Payments made			(3,632)	(2,192)
Restructuring reserve, ending balance	6,980	13,947	6,980	13,947
Other Acquisition Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			6,117	12,370
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			4,235	4,778
Restructuring charges			6,117	12,370
Fixed asset disposals				(1,799)
Payments made			(6,908)	(12,856)
Restructuring reserve, ending balance	$ 3,444	$ 2,493	$ 3,444	$ 2,493