Income Taxes Net Deferred Tax Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Components of Deferred Tax Assets and Liabilities [Abstract]
Property, equipment and intangible assets	$ (8,553)	$ (9,875)
Accrued compensation	14,693	20,553
Accrued expenses	9,711	5,302
Foreign operations	186	66
Capital loss carryovers	484	1,047
Deferred tax asset on unrecognized tax positions	2,226	2,138
Other	807	650
Net deferred tax assets	19,554	19,881
Current deferred tax assets (liability)	4,136	(2,784)
Non-current net deferred tax assets	$ 15,418	$ 22,665