Restructuring Charges (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Restructuring and Related Activities [Abstract]
Restructuring charges	$ 3,500,000	$ 4,811,000	[1]	$ 5,116,000	[1]	$ 0
Restructuring charges payable	3,200,000	3,200,000
Reversal of non-cash equity compensation expense		$ 100,000		$ 500,000

[1] As disclosed on the Company's consolidated statements of cash flows, total non-cash equity compensation expense was $3.9 million and $5.0 million in 2012 and 2011, respectively. Included in non-cash equity compensation expense in 2012 and 2011 were net charges to expense of approximately $0.1 million and reversals of expense of approximately $0.5 million, respectively, which were generated in connection with restructuring activities. Accordingly, these amounts are reflected as restructuring charges in the Company's 2012 and 2011 consolidated statements of operations. See Note 14, Restructuring charges for further information.