Commitments and Contingencies (Deferred Branding Incentives) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Deferred branding incentives possibility of repayment	$ 1.4
Deferred branding incentives possibility of repayment by branded dealers	0.3
Deferred revenue, noncurrent	$ 1.1	$ 1.0

- Definition

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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