Investments (Reclassifications of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Cash flow hedges—Currency/Interest rate
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Amount Reclassified from AOCI	$ 606	$ 1,540
Net unrealized investment gains (losses) on available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Amount Reclassified from AOCI	(858)	3,112
Total net unrealized investment gains (losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Amount Reclassified from AOCI	(252)	4,652	$ 4,776
Accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Amount Reclassified from AOCI	$ (252)	$ 4,652	$ 4,776