Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Components of Deferred Tax Assets [Abstract]
Deferred Tax Assets Tax Accruals And Allowance	$ 25,756		$ 24,488
Deferred Tax Assets, Operating Loss Carryforwards	6,210		7,069
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	12,416		11,061
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent	2,137		1,963
Deferred Tax Assets, Deferred Income	1,654		1,535
Deferred Tax Assets, Tax Credit Carryforwards	1,769		1,183
Deferred Tax Assets Intangible Assets	21,916		1,791
Deferred Tax Assets, Other	142		0
Deferred Tax Assets, Tax Deferred Expense	72,000		49,090
Components of Deferred Tax Liabilities [Abstract]
Deferred Tax Liabilities Deferred Expense Depreciation And Amortization	1,245		1,514
Other deferred tax liabilities	0		102
Deferred Tax Liabilities, Net	1,245		1,616
Deferred Tax Assets, Valuation Allowance	(3,020)	[1]	0
Deferred income taxes	29,039		27,239
Non-current deferred income taxes	38,696		20,235
Deferred Tax Assets, Net	$ 67,735		$ 47,474

[1] Valuation allowance is presented gross. The valuation allowance net of the federal tax effect is ($1,963).