Goodwill and Other Intangibles, Net (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010		Dec. 31, 2009
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Gross goodwill	$ 241,090
Accumulated impairment losses	(9,713)
Goodwill, net	231,377
Finite-Lived Intangible Assets [Abstract]
Gross carrying amount	367,621
Accumulated amortization	(225,739)	(180,223)
Goodwill and other intangible assets	598,998
Amortization of Intangible Assets	45,500	45,500		27,600
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2012	44,929
2013	44,240
2014	27,352
2015	13,006
2016	11,489
Thereafter	866
Total	141,882
Customer Lists [Member]
Finite-Lived Intangible Assets [Abstract]
Gross carrying amount	257,983
Accumulated amortization	(155,318)	(119,835)
Technology-based [Member]
Finite-Lived Intangible Assets [Abstract]
Gross carrying amount	90,147
Accumulated amortization	(59,749)	(52,654)
Marketing-based [Member]
Finite-Lived Intangible Assets [Abstract]
Gross carrying amount	19,491
Accumulated amortization	(10,672)	(7,734)
As Restated [Member]
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Gross goodwill		241,090
Accumulated impairment losses		(9,713)
Goodwill, net		231,377	[1]
Finite-Lived Intangible Assets [Abstract]
Gross carrying amount		367,621
Goodwill and other intangible assets		598,998
As Restated [Member] | Customer Lists [Member]
Finite-Lived Intangible Assets [Abstract]
Gross carrying amount		257,983
As Restated [Member] | Technology-based [Member]
Finite-Lived Intangible Assets [Abstract]
Gross carrying amount		90,147
As Restated [Member] | Marketing-based [Member]
Finite-Lived Intangible Assets [Abstract]
Gross carrying amount		$ 19,491

[1] As restated - See Note 23 “Restatement of Previously Issued Financial Statements” of Notes to Consolidated Financial Statements.