Investments (Reclassifications of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014
Cash flow hedges - Currency/Interest rate
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from AOCI	$ (523)	$ 1,278
Net unrealized investments gains (losses) on available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from AOCI	2,453	2,766
Total net unrealized investment gains (losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from AOCI	1,930	4,044	$ 5,920
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from AOCI	$ 1,930	$ 4,044	$ 5,920