Leases - Future Minimum Lease Payments, Lessor Operating Leases, and Lease Guarantees (Details) $ in Thousands	Jun. 30, 2019 USD ($) item restaurant lease	Dec. 30, 2018 USD ($)
Lease Costs
Remainder of 2019	$ 16,119
2019		$ 40,834
2020	35,862	36,631
2021	31,089	31,159
2022	25,580	25,188
2023	19,748	18,694
Thereafter	69,787	57,304
Total future minimum lease payments	198,185	209,810
Less imputed interest	(45,425)
Less lease liabilities held for sale	(4,199)
Total present value of Lease Liabilities	148,561
Expected Sublease Income:
Remainder of 2019	4,174
2019		8,079
2020	8,326	8,061
2021	8,180	7,818
2022	7,969	7,462
2023	7,733	7,182
Thereafter	46,502	42,518
Total future minimum lease payments	$ 82,884	$ 81,120
Number of domestic leases for which the Company is contingently liable | lease	94
Estimated maximum amount of undiscounted payments in the event of nonpayment by primary lessees	$ 10,000
Domestic and international tractors and trailers
Expected Sublease Income:
Number of units included in future rental commitments | item	65
Estimated future rental commitment of operating leases that have not yet commenced	$ 12,000
Domestic and international tractors and trailers | Maximum
Expected Sublease Income:
Term of additional leases that have not yet commenced	7 years
United Kingdom franchise-owned restaurants
Expected Sublease Income:
Number of units leased and subleased | restaurant	361
Initial lease terms on franchised sites	15 years