Income Taxes (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
State Jurisdiction | Kansas
Operating Loss Carryforwards [Line Items]
Income tax credit	$ 6.6
Tax Year 2012 [Member]
Operating Loss Carryforwards [Line Items]
Income Tax Examination, Year under Examination	2012
Tax Year 2013 [Member]
Operating Loss Carryforwards [Line Items]
Income Tax Examination, Year under Examination	2013