Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Components of Deferred Tax Assets [Abstract]
Deferred Tax Assets Tax Accruals And Allowance	$ 24,488	$ 20,738
Deferred Tax Assets, Operating Loss Carryforwards	7,069	7,837
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	11,061	8,133
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent	1,963	2,258
Deferred Tax Assets, Deferred Income	1,535	1,552
Deferred Tax Assets, Tax Credit Carryforwards	1,183	1,410
Deferred Tax Assets Intangible Assets	1,791	0
Deferred Tax Assets, Other	0	261
Deferred Tax Assets, Tax Deferred Expense	49,090	42,189
Components of Deferred Tax Liabilities [Abstract]
Deferred Tax Liabilities, Intangible Assets	0	(1,107)
Deferred Tax Liabilities Deferred Expense Depreciation And Amortization	(1,514)	(1,535)
Other deferred tax liabilities	102	0
Deferred Tax Liabilities, Net	(1,616)	(2,642)
Deferred income taxes	27,239	22,691
Non-current deferred income taxes	20,235	16,856
Deferred Tax Assets, Net	$ 47,474	$ 39,547