Income Taxes Deferred Tax Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Components of Deferred Tax Assets and Liabilities [Abstract]
Property, equipment and intangible assets	$ (9,875)	$ (8,193)
Accrued compensation	20,553	19,107
Accrued expenses	5,302	11,424
Foreign operations	66	313
Deferred Tax Assets, Capital Loss Carryforwards	1,047	951
Deferred Tax Assets On Unrecognized Tax Positions	2,138	954
Other	650	308
Net deferred tax assets	19,881	24,864
Current deferred tax assets	(2,784)	429
Non-current net deferred tax assets	$ 22,665	$ 24,435