Income Taxes Income Taxes (Schedule of Deferred Tax and Related Valuation Allowance) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Net operating loss and credit carryforwards	$ 9,323	$ 35,202
Depreciation and amortization	30,702	60,935
Compensation costs	35,959	32,221
Impairment loss on marketable securities	0	5,005
Other	15,530	20,782
Deferred tax assets	91,514	154,145
Acquired intangible assets not deductible	(16,972)	(22,784)
Internal-use software capitalized	(24,165)	(20,527)
Impairment loss on marketable securities	(15)	0
Deferred tax liabilities	(41,152)	(43,311)
Valuation allowance	(433)	(7,407)
Net deferred tax assets	$ 49,929	$ 103,427