Employee Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee Benefits
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%
Defined Contribution Plan, Maximum Employer Matching Per Employee, Percent	2.00%
Defined Contribution Plan, Employer Contribution Vesting Period	4 years
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0.7	$ 0.7	$ 0.6
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	1.75%	1.75%
Defined Benefit Plan, Benefit Obligation	$ 1.6	$ 1.1
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax		0.2
Pension Expense	$ 0.1	$ 0.2