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Property and Equipment (Schedule of Capitalized Internal-Use Software Costs) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property and Equipment [Abstract]
Gross costs capitalized	$ 230,938	$ 181,376
Less: cumulative impairments	(8,024)	(3,458)
Gross costs capitalized, excluding cumulative impairments	222,914	177,918
Less: accumulated amortization	(152,140)	(117,936)
Net book value of capitalized internal-use software	$ 70,774	$ 59,982

For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.