Goodwill and Other Intangible Assets (Details 2) (USD $)	9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010
Components of amortized intangible assets
Gross Carrying Amount	$ 318,790,000	$ 302,544,000
Accumulated Amortization	(112,743,000)	(102,428,000)
Amortization expense for intangible assets	13,700,000
Estimated amortization expense
Remainder of 2011	4,400,000
2012	17,300,000
2013	16,800,000
2014	15,800,000
2015	15,600,000
2016	15,600,000
Contract based
Components of amortized intangible assets
Gross Carrying Amount	20,947,000	15,447,000
Accumulated Amortization	(13,257,000)	(12,468,000)
Technology based
Components of amortized intangible assets
Gross Carrying Amount	91,340,000	92,149,000
Accumulated Amortization	(33,829,000)	(29,629,000)
Marketing related
Components of amortized intangible assets
Gross Carrying Amount	26,360,000	26,833,000
Accumulated Amortization	(13,602,000)	(13,253,000)
Customer relationships
Components of amortized intangible assets
Gross Carrying Amount	180,143,000	168,115,000
Accumulated Amortization	$ (52,055,000)	$ (47,078,000)