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Business Combinations, Goodwill and Intangible Assets, Net Changes in Carrying Amount of Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Net	$ 402,425	$ 407,375
Additions to intangible assets related to business combinations	33,800
Change in accumulated amortization	$ (38,750)

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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