Investments (Trading Account Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Major Types of Investment Securities [Line Items]
Trading Securities, Change in Unrealized Holding Gain (Loss)	$ 1,400	$ (2,800)	$ 3,500	$ (2,200)
Amortized Cost	35,599		35,599		$ 65,326
Fair Value	38,410		38,410		64,612
Fixed maturities
Major Types of Investment Securities [Line Items]
Amortized Cost	23,552		23,552		50,565
Fair Value	20,444		20,444		46,364
Equity securities
Major Types of Investment Securities [Line Items]
Amortized Cost	12,047		12,047		14,761
Fair Value	$ 17,966		$ 17,966		$ 18,248