Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Accrued liabilities, current	Mar. 31, 2014 Facility Exit Costs	Dec. 31, 2013 Facility Exit Costs	Mar. 31, 2014 Severance and Benefits
Changes in the restructuring accrual
Balance of restructuring accrual at the beginning of the period	$ 998	$ 700	$ 185	$ 185	$ 813
Restructuring charges	174				174
Cash payments	(492)				(492)
Balance of restructuring accrual at the end of the period	$ 680	$ 700	$ 185	$ 185	$ 495