RELATED PERSON TRANSACTIONS - Atlantic Automotive Corporation and Leased Property by Real Estate Venture (Details) $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($) lease real_estate_venture restaurant	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Advertising time \| Atlantic Automotive
Related person transactions
Amount received	$ 0.6	$ 0.4	$ 0.4
Leased assets or facilities \| Atlantic Automotive
Related person transactions
Amount received	$ 1.1	1.2	1.0
Number of real estate ventures \| real_estate_venture	1
Real estate ventures in Baltimore, MD \| Leased assets or facilities \| Chief Executive Officer
Related person transactions
Amount received	$ 0.7	0.6	0.5
Number of real estate ventures \| real_estate_venture	1
Number of ground lease properties \| lease	1
Number of restaurants owned by a related party \| restaurant	3
Amount paid	$ 0.1	0.1	0.1
Real Estate Ventures In Towson M D \| Leased assets or facilities \| Chief Executive Officer
Related person transactions
Amount received	$ 0.4	$ 0.3	$ 0.3

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- Definition

Represents the number of restaurants owned by related parties.

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- Definition

Number of separate real estate development properties located on land subject to ground leases.

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Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

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