New Accounting Pronouncements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net of tax changes in accumulated other comprehensive income by component
Balance at the beginning of the period			$ 3,022	$ 2,318
Other comprehensive (loss) income:
Foreign currency translation adjustment	302	732	(697)	565
Unrealized holding gains (losses) on corporate debt securities		49	(98)	134
Realized gain on redemption of corporate debt securities			(1,296)
Balance at the end of the period	931	3,017	931	3,017
Foreign Currency
Net of tax changes in accumulated other comprehensive income by component
Balance at the beginning of the period			1,628	1,203
Other comprehensive (loss) income:
Foreign currency translation adjustment			(697)	565
Balance at the end of the period	931	1,768	931	1,768
Available for sale securities
Net of tax changes in accumulated other comprehensive income by component
Balance at the beginning of the period			1,394	1,115
Other comprehensive (loss) income:
Unrealized holding gains (losses) on corporate debt securities			(98)	134
Realized gain on redemption of corporate debt securities			(1,296)
Balance at the end of the period		$ 1,249		$ 1,249