Investments (Net Impairment Losses) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($) security
Investments, Debt and Equity Securities [Abstract]
Total other-than-temporary impairment recoveries (losses) on debt securities	$ 3,053	$ 125	$ 909
Portion recognized in comprehensive income	(3,053)	(132)	(1,151)
Net impairment losses (gains) on debt securities recognized in earnings	0	(7)	(242)
Equity securities impairments	(252)	(143)	(63)
Net OTTI losses recognized in earnings	$ (252)	$ (150)	$ (305)
Number of debt securities | security			1