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Intangible and Other Assets (Details Textual) (USD $)	12 Months Ended
Intangible and Other Assets (Details Textual) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Intangible And Other Assets (Textual) [Abstract]
Amortization of deferred financing costs	$ 8,977,000	$ 5,303,000	$ 3,913,000
Amortization of Intangible Assets	$ 24,600,000	$ 28,200,000	$ 30,500,000
Marketing related [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life, Maximum	20
Useful Life, Minimum	5
Customer related [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life, Maximum	20
Useful Life, Minimum	10
Technology based [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life, Maximum	20
Contract based [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life, Maximum	11
Useful Life, Minimum	2

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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