Other Intangibles (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Other Intangible Assets
Gross Carrying Amount	$ 58,045,000		$ 60,045,000
Accumulated Amortization	23,893,000		24,818,000
Other intangible assets not subject to amortization	8,700,000
Amortization expense of other intangible assets	1,100,000	1,100,000
Trade names
Other Intangible Assets
Gross Carrying Amount	8,400,000		10,400,000
Accumulated Amortization			2,000,000
Customer-related intangibles
Other Intangible Assets
Gross Carrying Amount	27,851,000		27,851,000
Accumulated Amortization	7,266,000		6,712,000
Useful lives	13 years 1 month 6 days
Proprietary software
Other Intangible Assets
Gross Carrying Amount	21,501,000		21,501,000
Accumulated Amortization	16,627,000		16,106,000
Useful lives	6 years 7 months 6 days
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
Other intangible assets not subject to amortization	$ 8,400,000