Summary of Other Investments (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Schedule Of Investments [Abstract]
Short-term investments	[1]	$ 30,447	$ 30,327
Debt security, held-to-maturity	[1]	15,000	15,000
Equity investments		6,017	6,603
Total other investments		$ 51,464	$ 51,930

[1] Included in other investments on the consolidated balance sheets.