Investments (Purchased Credit Impaired Investments) (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Acquired [Abstract]
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Acquired, Contractually Required Payments Receivable at Acquisition		$ 217,187	$ 96,617
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Acquired, Cash Flows Expected to be Collected at Acquisition	[1]	179,025	76,551
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Acquired, at Acquisition, at Fair Value		$ 137,399	$ 53,950

[1] Represents undiscounted principal and interest cash flow expectations at the date of acquisition.