Series B Convertible Preferred Stock (Details) - USD ($) $ / shares in Units, shares in Millions			3 Months Ended
	Mar. 29, 2019	Feb. 03, 2019	Mar. 31, 2019
Redeemable Preferred Shares
Preferred stock dividend rate			3.60%
Authorized shares of preferred stock			5.0
Temporary equity			$ 251,303,000
Issuance costs			7,179,000
Dividends paid to preferred shareholders			2,040,000
Preferred dividends			1,100,000
Common stock dividends paid to preferred shareholders			900,000
Series B Preferred Stock
Redeemable Preferred Shares
Temporary equity			251,300,000
Temporary equity adjustment			5,900,000
Dividends paid to preferred shareholders			2,000,000
Series B Preferred Stock | Franchisee
Redeemable Preferred Shares
Aggregate purchase price of shares	$ 2,500,000
Temporary equity adjustment			300,000
Series B Preferred Stock | Securities Purchase Agreement
Redeemable Preferred Shares
Aggregate purchase price of shares	$ 50,000,000	$ 200,000,000
Preferred stock, par value		$ 0.01
Purchase price per share		$ 1,000
Preferred stock dividend rate		3.60%
Conversion rate		$ 50.06
Initial redemption term		8 years
Exchange Cap (as a percent)		19.99%
Issuance costs			7,200,000
Temporary equity adjustment			$ 5,600,000
Redemption value		$ 252,500,000