Stock-Based Compensation Employee Stock Purchase Plan (Details) (Employee Stock Purchase Plan [Member]) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Employee Stock Purchase Plan [Member]
[Line Items]
Shares of stock sold to employees(1)	10	[1]	14	[1]

[1] Stock sold to employees during each fiscal quarter under the ESPP is associated with the offering period ending on the last day of the previous fiscal quarter.