New Accounting Standards Schedule of Prior Period Adjustments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 30, 2018
Prior Period Adjustments Restatement
Properties	$ 1,003,231	$ 1,023,267
Finance lease assets	195,368	189,969
Current portion of long-term debt	23,250	23,250
Current portion of finance lease liabilities	9,380	8,405
Long-term debt	2,301,563	2,305,552
Long-term finance lease liabilities	$ 458,595	447,231
Total of balance sheet line items affected by prior period reclassifications		1,429,490
Previously Reported
Prior Period Adjustments Restatement
Properties		1,213,236
Finance lease assets		0
Current portion of long-term debt		31,655
Current portion of finance lease liabilities		0
Long-term debt		2,752,783
Long-term finance lease liabilities		0
Total of balance sheet line items affected by prior period reclassifications		1,429,490
Restatement Adjustment
Prior Period Adjustments Restatement
Properties		(189,969)
Finance lease assets		189,969
Current portion of long-term debt		(8,405)
Current portion of finance lease liabilities		8,405
Long-term debt		(447,231)
Long-term finance lease liabilities		447,231
Total of balance sheet line items affected by prior period reclassifications		$ 0