Commitments and Contingencies - Commitments Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Maximum potential funding under commitments	$ 104,000,000	$ 112,000,000
Commitments to fund certain limited partnerships or subsidiaries [Member]
Loss Contingencies [Line Items]
Maximum potential funding under commitments	12,000,000	$ 14,000,000
Commitments funded	$ 2,000,000