Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating lease costs
Fixed	$ 127,571	$ 127,990
Short-term	27,654	23,658
Variable	38,321	37,975
Sub-leases	(1,152)	(848)
Operating lease costs	192,394	188,775
Finance lease costs
Amortization of leased assets	6,423	4,015
Interest on lease liabilities	690	491
Finance lease costs	7,113	4,506
Net lease costs	199,507	193,281
Cost of Sales
Operating lease costs
Fixed	25,067	30,002
Short-term	11,633	9,725
Variable	8,285	8,123
Sub-leases	(411)	(311)
Operating lease costs	44,574	47,539
Selling, general and administrative expenses
Operating lease costs
Fixed	102,504	97,988
Short-term	16,021	13,933
Variable	30,036	29,852
Sub-leases	(741)	(537)
Operating lease costs	147,820	141,236
Depreciation and Amortization
Finance lease costs
Amortization of leased assets	6,423	4,015
Interest on lease liabilities	0	0
Finance lease costs	6,423	4,015
Interest
Finance lease costs
Amortization of leased assets	0	0
Interest on lease liabilities	690	491
Finance lease costs	$ 690	$ 491