Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Changes in the components of accumulated other comprehensive loss
Balance at beginning of the period			$ (2,975)
Other comprehensive loss before reclassifications			(826)
Other comprehensive income (loss), net of tax	(306)	(640)	(826)	365
Balance at end of the period	(3,801)		(3,801)
Cumulative Translation
Changes in the components of accumulated other comprehensive loss
Balance at beginning of the period			(2,976)
Other comprehensive loss before reclassifications			(805)
Other comprehensive income (loss), net of tax			(805)
Balance at end of the period	(3,781)		(3,781)
Unrealized gains (losses) on available for sale securities
Changes in the components of accumulated other comprehensive loss
Balance at beginning of the period			1
Other comprehensive loss before reclassifications			(21)
Other comprehensive income (loss), net of tax			(21)
Balance at end of the period	$ (20)		$ (20)