Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net unrealized gain (loss) on investments, net of tax of $(14) at December 31, 2011 and $5,005 at December 31, 2010	$ 191	$ (7,844)
Foreign currency translation adjustments	(1,450)	2,103
Accumulated other comprehensive loss	(1,259)	(5,741)
Accumulated other comprehensive income loss available for sale securities adjustment tax	$ (14)	$ 5,005