Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Mar. 31, 2012
Summary of restructuring reserve
Restructuring reserve, beginning balance	$ 2,007	$ 2,318
Liabilities recognized
Payments	(294)	(311)
Restructuring reserve, ending balance	1,713	2,007
Employee Separation Costs [Member]
Summary of restructuring reserve
Restructuring reserve, beginning balance		20
Liabilities recognized
Payments		(20)
Restructuring reserve, ending balance
Contract Termination Costs [Member]
Summary of restructuring reserve
Restructuring reserve, beginning balance	2,007	2,298
Liabilities recognized
Payments	(294)	(291)
Restructuring reserve, ending balance	$ 1,713	$ 2,007