Summary of Significant Accounting Policies New Accounting Standards Adopted (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 31, 2018	Dec. 29, 2019
New Accounting Pronouncements or Change in Accounting Principle
Operating lease assets		$ 857,199
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle
Operating lease liabilities	$ 1,011,000
Operating lease assets	934,000
Favorable leases	23,000
Unfavorable leases	30,000
Straight-line rent in excess of minimum rents paid	67,000
Effect on future earnings, amount		38,000
Effect on future earnings, offset amount		$ 38,000
Cumulative effect on retained earnings, net of tax	$ 1,105