Income Taxes (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017
Operating Loss Carryforwards [Line Items]
Effective income tax rate	39.20%	38.30%
Federal statutory tax rate	35.00%	35.00%
Valuation allowance	$ 3.4
State Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	4.2
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	$ 11.2
Retained earnings [Member] | Accounting Standards Update 2016-09 [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax assets, noncurrent			$ 0.7