Property and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 63,497,000	$ 66,620,000
Less: accumulated depreciation and amortization	(48,643,000)	(48,907,000)
Property and equipment, net	14,854,000	17,713,000
Depreciation	8,000,000	7,300,000	5,400,000
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	26,779,000	26,560,000
Office Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	30,745,000	32,905,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 5,973,000	$ 7,155,000