Restructuring Liability (Details) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2010	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011	Dec. 31, 2003
Restructuring Cost and Reserve [Line Items]
Restructuring expense		$ 12,048,000	$ 696,000	$ 12,863,000	$ 1,650,000
Non-cash Expense				5,856,000	8,070,000
Kendall Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Lease term (in years)	15 years
Discount rate, lease restructuring liability (as a percent)										10.00%
Restructuring expense		524,000	696,000	1,339,000	1,650,000
Cash payments		(3,901,000)	(3,726,000)	(11,323,000)	(11,137,000)
Restructuring Reserve		21,344,000	24,155,000	21,344,000	24,155,000	22,051,000	23,328,000	24,830,000	26,313,000
Strategic Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Strategic Restructuring		11,444,000
Cash payments		0
Non-cash Expense		(6,650,000)
Restructuring Reserve		4,794,000		4,794,000
Strategic Restructuring [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		409,000
Cash payments		0
Non-cash Expense		0
Restructuring Reserve		409,000		409,000
Strategic Restructuring [Member] | Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		4,385,000
Cash payments		0
Non-cash Expense		0
Restructuring Reserve		4,385,000		4,385,000
Strategic Restructuring [Member] | Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		6,650,000
Cash payments		0
Non-cash Expense		(6,650,000)
Restructuring Reserve		0		0
Strategic Restructuring [Member] | Subsequent Event [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges				35,000,000
Strategic Restructuring [Member] | Subsequent Event [Member] | Minimum [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges				20,000,000
Strategic Restructuring [Member] | Subsequent Event [Member] | Minimum [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges				9,000,000
Strategic Restructuring [Member] | Subsequent Event [Member] | Minimum [Member] | Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges				6,000,000
Strategic Restructuring [Member] | Subsequent Event [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges				45,000,000
Strategic Restructuring [Member] | Subsequent Event [Member] | Maximum [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges				25,000,000
Strategic Restructuring [Member] | Subsequent Event [Member] | Maximum [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges				12,000,000
Strategic Restructuring [Member] | Subsequent Event [Member] | Maximum [Member] | Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges				$ 8,000,000