Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified			6 Months Ended				6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Restructuring Plan 2013	Jun. 30, 2014 Restructuring Plan 2013 Employee separation costs	Jun. 30, 2014 Restructuring Plan 2013 Consolidation of leased facilities	Dec. 31, 2013 Restructuring Plan 2013 Consolidation of leased facilities	Jun. 30, 2014 Restructuring Plan 2012 Employee separation costs	Jun. 30, 2014 Restructuring Plan 2011	Jun. 30, 2014 Restructuring Plan 2011 Employee separation costs	Jun. 30, 2014 Restructuring Plan 2011 Consolidation of leased facilities	Jun. 30, 2014 Restructuring Plan 2010 Consolidation of leased facilities
Restructuring Charges
Balance at the beginning of the period	$ 3,071	$ 3,768	$ 335	$ 235	$ 100	$ 100	$ 75	$ 1,574	$ 7	$ 1,567	$ 1,784
Utilized - cash			(37)	(37)			(14)	(461)	(7)	(454)	(188)
Other			3	3
Balance at the end of the period	$ 3,071	$ 3,768	$ 301	$ 201	$ 100	$ 100	$ 61	$ 1,113		$ 1,113	$ 1,596