Leases - Supplemental balance sheet information (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Operating Leases
Right of use operating lease assets	$ 331,329	$ 323,003
Finance Leases
Property, plant and equipment, gross	36,797	35,271
Accumulated depreciation	(6,725)	(5,664)
Property, plant and equipment, net	30,072	29,607
Total lease assets	361,401	352,610
Operating Leases
Other current	106,673	101,945
Non-current	238,830	228,155
Total operating liabilities	345,503	330,100
Finance Leases
Short-term debt	5,266	4,835
Long-term debt	25,611	25,214
Total finance liabilities	30,877	30,049
Total lease liabilities	$ 376,380	$ 360,149