Exit Activities and Reductions in Force (Details) (Employee Separation Costs [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Employee Separation Costs [Member]
Summary of exit activities and reduction in force initiatives
Accrual, Beginning balance	$ 0	$ 670
Charges	7,160	38
Cash Payments	(3,398)	(565)
Non-cash Amounts	(1,066)
Accrual, Ending balance	$ 2,696	$ 143