Stock-Based Compensation Employee Stock Purchase Plan (Details) - shares shares in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Employee Stock Purchase Plan [Member]
[Line Items]
Shares of stock sold to employees(1)	[1]	18	20	28	34

[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.