Acquisitions - Narrative (Details) $ in Thousands	Dec. 16, 2019 USD ($) store	May 30, 2019 USD ($) store	Jun. 30, 2020 store	Mar. 31, 2020 store	Dec. 31, 2019 store	Jun. 30, 2019 store	Mar. 31, 2019 store	Dec. 31, 2018 store
Business Acquisition [Line Items]
Number of owned and franchised locations | store			2,059	2,039	2,001	1,859	1,806	1,742
New Jersey Acquisition
Business Acquisition [Line Items]
Number of owned and franchised locations | store	12
Acquisition, gross cash payments	$ 37,812
Loss on reacquired franchise rights	1,810
Consideration transferred	$ 36,002
Maine Acquisition
Business Acquisition [Line Items]
Number of owned and franchised locations | store		4
Acquisition, gross cash payments		$ 14,801