Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Corporate taxation of built-in gains, subjection term	10 years
Recognition period before January 1, 2011 modified by the Small Business Jobs Act of 2010	5 years
Reduced holding period for sales modified by the American Taxpayer Relief Act of 2012	5 years
Statutory Federal Income Tax Rate	35.00%
Idaho Investment Tax Credits	$ 3,200
Valuation allowance	488	$ 0	$ 2,200
Change in Valuation Allowance		$ 1,800
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	17,400
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 18,100