Income Taxes - Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 33	$ (13,542)	$ (2,693)
Tax Credit Carryforward, Amount	5,900
Capital loss carryforwards and other than temporary impairment	2,099	2,105
Expired Capital Loss Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	100	63,700
Capital loss carryforwards and other than temporary impairment	0	22,300
Capital Loss Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 2,099	$ 2,105