Other Liabilities, Long-Term (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Dec. 30, 2018
Other Liabilities, Noncurrent [Abstract]
Deferred rent	$ 0		$ 16,610
Unfavorable leases, net	28		12,348
Accrual for closed restaurants, long-term	442		3,074
Accrued workers' compensation and general liability claims	3,429		4,398
Deferred compensation	3,644		3,610
Other	120		120
Other Liabilities	7,663		40,160
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unfavorable leases, accumulated amortization	$ 6,019		$ 6,075
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unfavorable leases, accumulated amortization		$ 12,300
Deferred Rent, Noncurrent		16,600
Unamortized Lease Incentives, Noncurrent		$ 2,600