Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gains (losses) arising during the period, before U.S. income taxes	$ 1,516	$ (5,258)	$ (10,061)	$ 8,132
U.S. income taxes	104	787	1,434	(2,200)
Unrealized gains (losses) arising during the period, net of U.S. income taxes	1,620	(4,471)	(8,627)	5,932
Less reclassification adjustment:
Net realized investment gains (losses)	58	(62)	681	(1,834)
U.S. income taxes	(24)	11	162	682
Reclassification adjustment for investment gains (losses) realized in net income	34	(51)	843	(1,152)
Other comprehensive income	$ 1,586	$ (4,420)	$ (9,470)	$ 7,084