Goodwill and Other Intangibles (Details 2) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Other Intangible Assets
Gross Carrying Amount	$ 59,342,000		$ 59,342,000		$ 52,392,000
Accumulated Amortization	17,572,000		17,572,000		15,608,000
Other intangible assets not subject to amortization	8,600,000		8,600,000
Trade names
Other Intangible Assets
Gross Carrying Amount	10,400,000		10,400,000		10,400,000
Accumulated Amortization	1,165,000		1,165,000		1,036,000
Useful lives (in years)	5.0
Customer related intangibles
Other Intangible Assets
Gross Carrying Amount	27,851,000		27,851,000		20,901,000
Accumulated Amortization	3,389,000		3,389,000		2,571,000
Useful lives (in years)	7.8
Proprietary software
Other Intangible Assets
Gross Carrying Amount	20,876,000		20,876,000		20,876,000
Accumulated Amortization	13,018,000		13,018,000		12,001,000
Useful lives (in years)	17.6
Trading rights
Other Intangible Assets
Other intangible assets not subject to amortization	165,000		165,000		165,000
Other
Other Intangible Assets
Gross Carrying Amount	50,000		50,000		50,000
Amortization expense of other intangible assets	1,000,000	700,000	2,000,000	1,400,000
POSIT trade name
Other Intangible Assets
Other intangible assets not subject to amortization	$ 8,400,000		$ 8,400,000