Income Taxes - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Tax Credit Carryforward [Line Items]
Federal general business credit carryforwards	$ 0.2	$ 0.2
Limit on annual basis	1.2
Undistributed earnings	21.9
Accrued interest (less than)	0.1	0.1
General Business Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Federal and state net operating loss carryforwards	$ 1.6	$ 2.8