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Property and Equipment (Schedule of Capitalized Internal-Use Software Costs) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property and Equipment [Abstract]
Gross costs capitalized	$ 294,531	$ 230,938
Less: cumulative impairments	(22,090)	(8,024)
Gross costs capitalized, excluding cumulative impairments	272,441	222,914
Less: accumulated amortization	(185,430)	(152,140)
Net book value of capitalized internal-use software	$ 87,011	$ 70,774

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.