Significant Accounting Policies, Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Components of accumulated other comprehensive loss [Roll Forward]
Balance, beginning of period	[1]			$ 95,721
Current-period other comprehensive income (loss)		$ (53)	$ 7	(14)	$ 84
Balance, end of period		79,167		79,167
Accumulated Other Comprehensive Loss [Member]
Components of accumulated other comprehensive loss [Roll Forward]
Balance, beginning of period				(2,028)
Current-period other comprehensive income (loss)				(14)
Balance, end of period		(2,042)		(2,042)
Foreign Currency Translation Losses [Member]
Components of accumulated other comprehensive loss [Roll Forward]
Balance, beginning of period				(1,975)
Current-period other comprehensive income (loss)				(38)
Balance, end of period		(2,013)		(2,013)
Unrealized Losses on Investments [Member]
Components of accumulated other comprehensive loss [Roll Forward]
Balance, beginning of period				(53)
Current-period other comprehensive income (loss)				24
Balance, end of period		$ (29)		$ (29)

[1] Derived from the December 31, 2014 audited Consolidated Financial Statements included in our Annual Report on Form 10-K, as filed with the Securities and Exchange Commission ("SEC") on March 6, 2015.