Restructuring (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 27, 2013
Changes in the company's liability related to restructuring
Balance at the beginning of the period	$ 108,000	$ 1,427,000
Restructuring expense	50,830,000	(447,000)	7,094,000
Plus: Deferred rent obligation, prior to restructuring	2,160,000
Less: Non-cash charges	(12,491,000)	92,000	(1,711,000)
Payments for restructuring	(38,100,000)
Balance at the end of the period	2,491,000	108,000	1,427,000
Termination obligation under the Surrender Agreement				19,500,000
Termination obligation payable in cash under the Surrender Agreement				15,600,000
Deposit retained by landlord related to lease terminated				3,900,000
Settlement period of majority of remaining liability associated with restructuring	6 months
Lease termination - Company headquarters
Changes in the company's liability related to restructuring
Payments for restructuring	(19,500,000)
Severance and other compensation
Changes in the company's liability related to restructuring
Payments for restructuring	(11,715,000)		(2,578,000)
Third party vendor contracts and other costs
Changes in the company's liability related to restructuring
Payments for restructuring	(4,908,000)	(747,000)	(1,131,000)
Lease commitments, net of sublease income
Changes in the company's liability related to restructuring
Payments for restructuring	$ (1,993,000)	$ (217,000)	$ (247,000)