Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012
Summary of restructuring reserve
Restructuring reserve, beginning balance	$ 1,713	$ 2,007	$ 2,318
Liabilities recognized	10
Payments	(303)	(294)	(311)
Restructuring reserve, ending balance	1,420	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	1,713	2,007	2,298
Liabilities recognized	10
Payments	(303)	(294)	(291)
Restructuring reserve, ending balance	$ 1,420	$ 1,713	$ 2,007