Investments Expected Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Gross Amortized Cost
Due in one year or less	$ 155,342
Due after one year through five years	49,000
Total	204,342	$ 228,319
Fair Value
Due in one year or less	155,177
Due after one year through five years	48,788
Total	$ 203,965	$ 228,198