Shareholders' Equity - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	$ (11,435)	$ (12,752)
Unrealized gain (loss) on investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	68	(519)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	$ (11,503)	$ (12,233)