Redeemable Noncontrolling Interests - MT. Logan RE (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2016	Dec. 31, 2015	Dec. 31, 2014
Subsequent Event [Member]
Redeemable Noncontrolling Interest [Line Items]
Unaffiliated third party investments during period, net	$ 30,000
Logan Re [Member]
Redeemable Noncontrolling Interest [Line Items]
Voting common share percentage		100.00%
Investment, redeemable preferred shares, segregated accounts		$ 50,000
Unaffiliated third party investments during period, net		$ 306,848	$ 279,200