Goodwill and Other Intangibles (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Intangible Assets
Gross Carrying Amount	$ 60,045,000	$ 59,420,000
Accumulated Amortization	24,818,000	19,826,000
Other intangible assets not subject to amortization		8,700,000
Amortization expense of other intangible assets	5,000,000	4,200,000	3,000,000
Trade names
Other Intangible Assets
Gross Carrying Amount	10,400,000	10,400,000
Accumulated Amortization	2,000,000	1,293,000
Useful lives	4 years
Customer-related intangibles
Other Intangible Assets
Gross Carrying Amount	27,851,000	27,851,000
Accumulated Amortization	6,712,000	4,497,000
Useful lives	13 years 1 month 6 days
Proprietary software
Other Intangible Assets
Gross Carrying Amount	21,501,000	20,876,000
Accumulated Amortization	16,106,000	14,036,000
Useful lives	6 years 4 months 24 days
Trading rights
Other Intangible Assets
Gross Carrying Amount	243,000	243,000
Other
Other Intangible Assets
Gross Carrying Amount	50,000	50,000
Estimate of future amortization expense for acquired other intangibles
2013	4,302,000
2014	3,811,000
2015	2,654,000
2016	2,654,000
2017	2,654,000
Thereafter	10,460,000
Total	26,535,000
POSIT trade name
Other Intangible Assets
Other intangible assets not subject to amortization		$ 8,400,000