Restructuring Charges (Details) (USD $)	3 Months Ended	12 Months Ended			3 Months Ended
	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2012
Restructuring Charges
Balance at the end of the period		$ 3,768,000		$ 2,224,000
Restructuring Charges.	(75,000)	(75,000)	9,499,000
Restructuring Plan 2013
Restructuring Charges
Balance at the beginning of the period				335,000
Utilized - cash				(37,000)
Other				(298,000)
Restructuring Charges.	1,600,000
Reversal of accruals				300,000
Restructuring Plan 2013 | Employee separation and related costs
Restructuring Charges
Balance at the beginning of the period				235,000
Utilized - cash				(37,000)
Other				(198,000)
Restructuring Plan 2013 | Consolidation of leased facilities
Restructuring Charges
Balance at the beginning of the period				100,000
Other				(100,000)
Restructuring Plan 2012
Restructuring Charges
Restructuring Charges.					9,500,000
Reversal of accruals		800,000		100,000
Restructuring Plan 2012 | Employee separation and related costs
Restructuring Charges
Balance at the beginning of the period				75,000
Utilized - cash				(23,000)
Other				(52,000)
Restructuring Plan 2011
Restructuring Charges
Balance at the beginning of the period				1,574,000
Utilized - cash				(741,000)
Balance at the end of the period		1,574,000		833,000
Reversal of accruals		700,000
Restructuring Plan 2011 | Employee separation and related costs
Restructuring Charges
Balance at the beginning of the period				7,000
Utilized - cash				(7,000)
Restructuring Plan 2011 | Consolidation of leased facilities
Restructuring Charges
Balance at the beginning of the period				1,567,000
Utilized - cash				(734,000)
Balance at the end of the period				833,000
Restructuring Plan 2010 | Consolidation of leased facilities
Restructuring Charges
Balance at the beginning of the period				1,784,000
Utilized - cash				(393,000)
Balance at the end of the period				$ 1,391,000