Property and Equipment (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	$ 70,135,000		$ 67,209,000
Accumulated Depreciation	(35,438,000)		(33,102,000)
Property and equipment, net	34,697,000		34,107,000
Depreciation expense	2,700,000	1,600,000
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	35,849,000		32,528,000
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	5,231,000		5,126,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	7,048,000		6,992,000
Software [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	20,445,000		19,870,000
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	$ 1,562,000		$ 2,693,000