Goodwill and Other Intangibles (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Other Intangible Assets
Gross Carrying Amount	$ 59,420,000		$ 59,420,000
Accumulated Amortization	20,953,000		19,826,000
Indefinite-lived intangibles assets not subject to amortization	8,700,000
Amortization expense of other intangible assets	1,100,000	1,000,000
Trade names
Other Intangible Assets
Gross Carrying Amount	10,400,000		10,400,000
Accumulated Amortization	1,358,000		1,293,000
Useful lives (in years)	5.0
Customer related intangibles
Other Intangible Assets
Gross Carrying Amount	27,851,000		27,851,000
Accumulated Amortization	5,051,000		4,497,000
Useful lives (in years)	13.1
Proprietary software
Other Intangible Assets
Gross Carrying Amount	20,876,000		20,876,000
Accumulated Amortization	14,544,000		14,036,000
Useful lives (in years)	6.4
Trading rights
Other Intangible Assets
Gross Carrying Amount	243,000		243,000
Other
Other Intangible Assets
Gross Carrying Amount	50,000		50,000
POSIT trade name
Other Intangible Assets
Indefinite-lived intangibles assets not subject to amortization	$ 8,400,000