Property, Equipment and Capitalized Software - Textual (Details) (USD $)	12 Months Ended												12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2012 Equipment [Member]	Dec. 31, 2011 Equipment [Member]	Dec. 31, 2012 Furniture and Fixtures [Member]	Dec. 31, 2011 Furniture and Fixtures [Member]	Dec. 31, 2012 Software Development [Member]	Dec. 31, 2011 Software Development [Member]	Dec. 31, 2012 Software [Member]	Dec. 31, 2011 Software [Member]	Dec. 31, 2012 Leasehold Improvements [Member]	Dec. 31, 2011 Leasehold Improvements [Member]	Dec. 31, 2012 Maximum Equipment [Member]	Dec. 31, 2012 Maximum Furniture and Fixtures [Member]	Dec. 31, 2012 Maximum Software Development [Member]	Dec. 31, 2012 Maximum Software [Member]	Dec. 31, 2012 Maximum Leasehold Improvements [Member]	Dec. 31, 2012 Minimum Equipment [Member]	Dec. 31, 2012 Minimum Furniture and Fixtures [Member]	Dec. 31, 2012 Minimum Software Development [Member]	Dec. 31, 2012 Minimum Software [Member]	Dec. 31, 2012 Minimum Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life													5 years	10 years	5 years	5 years	10 years	2 years	5 years	2 years	1 year	3 years
Capitalized computer software, additions	$ 400,000
Property, Plant and Equipment, Gross	25,501,000	26,905,000	7,244,000	6,876,000	3,217,000	3,035,000	5,088,000	5,088,000	2,626,000	2,674,000	3,976,000	3,031,000
Capitalized Computer Software, Accumulated Amortization	$ 1,500,000	$ 3,200,000