Investments (Trading Account Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Major Types of Investment Securities [Line Items]
Trading Securities, Change in Unrealized Holding Gain (Loss)	$ (100)	$ 200	$ 2,200	$ 900
Amortized Cost	35,596		35,596		$ 65,326
Fair Value	37,033		37,033		64,612
Fixed maturities
Major Types of Investment Securities [Line Items]
Amortized Cost	23,549		23,549		50,565
Fair Value	20,151		20,151		46,364
Equity securities
Major Types of Investment Securities [Line Items]
Amortized Cost	12,047		12,047		14,761
Fair Value	$ 16,882		$ 16,882		$ 18,248