Stock-Based Compensation Employee Stock Purchase Plan (Details) - shares shares in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Employee Stock Purchase Plan [Member]
[Line Items]
Shares of stock sold to employees(1)	[1]	11	10

[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.