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Goodwill and Intangible Assets (Schedule of Intangible Assets and Goodwill) (Details) (USD $) In Thousands	6 Months Ended	12 Months Ended							6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 Goodwill [Member]	Dec. 31, 2010 Goodwill [Member]	Dec. 31, 2009 Goodwill [Member]	Jun. 30, 2011 Intangible Asstes With Indefinite Lives [Member]	Dec. 31, 2010 Intangible Asstes With Indefinite Lives [Member]	Dec. 31, 2009 Intangible Asstes With Indefinite Lives [Member]	Jun. 30, 2011 Intangible Asstes With Finite Lives [Member]	Dec. 31, 2010 Intangible Asstes With Finite Lives [Member]
Goodwill and Intangible Assets, Net	$ 325,252	$ 328,735	$ 268,376	$ 268,376	$ 268,376	$ 23,920	$ 23,920	$ 23,920	$ 32,956	$ 36,439
Amortization	(1,533)	(3,483)							(1,533)	(3,483)
Goodwill and Intangible Assets, Net	323,719	325,252	268,376	268,376	268,376	23,920	23,920	23,920	31,423	32,956
Goodwill and Intangible Assets, Gross	340,652		268,532			23,920			48,200
Accumulated amortization	(9,911)								(9,911)
Accumulated impairments	$ (7,022)		$ (156)						$ (6,866)

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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