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Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 8,246,337	$ 8,048,906
Capitalized interest	14,321	15,980	$ 3,732
Capitalization of internal use computer software	38,329	34,650	$ 29,407
Asset retirement obligations	34,537	30,831
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	354,395	448,566
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	3,040,253	3,029,309
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	969,273	852,022
Racking
Property, Plant and Equipment [Line Items]
Property, plant and equipment	2,083,199	2,040,832
Warehouse equipment/vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment	499,787	483,218
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment	52,978	54,275
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment	746,993	689,261
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 499,459	$ 451,423
Minimum | Buildings and building improvements
Property, Plant and Equipment [Line Items]
Useful life	5 years
Minimum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Useful life	5 years
Minimum | Racking
Property, Plant and Equipment [Line Items]
Useful life	1 year
Minimum | Warehouse equipment/vehicles
Property, Plant and Equipment [Line Items]
Useful life	1 year
Minimum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Useful life	1 year
Minimum | Computer hardware and software
Property, Plant and Equipment [Line Items]
Useful life	2 years
Maximum | Buildings and building improvements
Property, Plant and Equipment [Line Items]
Useful life	40 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Useful life	10 years
Maximum | Racking
Property, Plant and Equipment [Line Items]
Useful life	20 years
Maximum | Warehouse equipment/vehicles
Property, Plant and Equipment [Line Items]
Useful life	10 years
Maximum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Useful life	10 years
Maximum | Computer hardware and software
Property, Plant and Equipment [Line Items]
Useful life	5 years

X

- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Additions made to capitalized computer software costs during the period.

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Amount, before accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

+ References

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