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	$ 75,682,000	$ 67,209,000
Accumulated depreciation and amortization	(40,428,000)	(33,102,000)
Property and equipment, net	35,254,000	34,107,000
Depreciation expense	10,900,000	8,000,000	5,700,000
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	40,180,000	32,528,000
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,260,000	5,126,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,394,000	6,992,000
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	20,199,000
Purchased Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross		19,870,000
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,649,000	$ 2,693,000