Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
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	$ 0.2	$ 0.2
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	1.75%		1.75%
Defined Benefit Plan, Benefit Obligation	$ 1.7		$ 1.6