Property and Equipment (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	$ 66,977,000		$ 66,977,000		$ 53,528,000
Accumulated Depreciation	(34,792,000)		(34,792,000)		(36,222,000)
Property and equipment, net	32,185,000		32,185,000		17,306,000	[1]
Depreciation expense	2,200,000	1,500,000	5,700,000	4,300,000
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	32,373,000		32,373,000		25,101,000
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	2,262,000		2,262,000		1,811,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	4,234,000		4,234,000		3,692,000
Software [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	21,500,000		21,500,000		20,641,000
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	$ 6,608,000		$ 6,608,000		$ 2,283,000

[1] Information derived from our December 31, 2011 audited Consolidated Financial Statements.