Property and Equipment (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 66,620,000	$ 59,860,000
Less: accumulated depreciation and amortization	(48,907,000)	(44,494,000)
Property and equipment, net	17,713,000	15,366,000
Depreciation	7,000,000	5,400,000	5,100,000
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	0	644,000
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	26,560,000	19,384,000
Office Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	32,905,000	32,372,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 7,155,000	$ 7,460,000

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

+ References+ Details

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References+ Details

- Definition

Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References+ Details

- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References+ Details