Income Taxes Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Decrease on qualified production deductions, current period, percent	2.30%
Decrease on qualified production deductions, prior period, percent	3.70%
Decrease on research tax credits, current period, percent	0.50%
Decrease on research tax credits, prior period, percent	2.90%
Unrecognized Tax Benefits	$ 3,400,000	$ 2,700,000	$ 6,700,000	$ 8,200,000
Unrecognized tax benefit changes in next 12 months	700,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	3,900,000	2,900,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued	100,000	100,000
Decrease in Accrued Interest Resulting From Release of Liabilities for Unrecognized Tax Benefits Related to Gift Card Income Deferral as a Result of New IRS Guidance, Net	1,000,000
Deferred Tax Assets, Valuation Allowance	$ 1,143,000	$ 1,100,000