Investments (Credit Loss Impairments Recognized) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance	$ 30,981	$ 36,057	$ 32,377	$ 35,424
Additions for credit loss impairments recognized in the current period on securities not previously impaired			554	0
Additions for credit loss impairments recognized in the current period on securities not previously impaired			0	2,570
Reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security	(709)	(603)	(1,318)	(1,075)
Reductions for credit loss impairments previously recognized on securities which matured, paid down, prepaid or were sold during the period	(1,168)	(1,146)	(2,509)	(2,611)
Ending balance	$ 29,104	$ 34,308	$ 29,104	$ 34,308