Summary of Significant Accounting Policies (Details 7) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Other comprehensive income (loss):
Balance at the beginning of the period			$ 383	$ 3,022
Foreign currency translation adjustment	619	(608)	(81)	(999)
Unrealized holding losses on corporate debt securities				(98)
Realized gain on redemption of corporate debt securities		(1,296)		(1,296)
Balance at the end of the period	302	629	302	629
Accumulated Translation Adjustment [Member]
Other comprehensive income (loss):
Balance at the beginning of the period			383	1,628
Foreign currency translation adjustment			(81)	(999)
Balance at the end of the period	302	629	302	629
Accumulated Net Unrealized Investment Gain Loss [Member]
Other comprehensive income (loss):
Balance at the beginning of the period				1,394
Unrealized holding losses on corporate debt securities				(98)
Realized gain on redemption of corporate debt securities				$ (1,296)