Income Taxes (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Income Taxes
Period for which prior cumulative losses considered in assessing the realization of deferred tax assets	2 years
Valuation allowance	$ 2.2	$ 2.5
Net deferred tax assets	$ 4.5	$ 4.6