Stock-Based Compensation Employee Stock Purchase Plan (Details) (Employee Stock Purchase Plan [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Employee Stock Purchase Plan [Member]
[Line Items]
Shares of stock sold to employees(1)	23	[1]	23	[1]	70	[1]	76	[1]
Weighted average fair value per ESPP award(2)	$ 6.42	[2]	$ 6.47	[2]	$ 6.61	[2]	$ 6.52	[2]

[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.

[2] Relating to awards associated with the offering periods during the three and nine months ended September 30.