Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Schedule of Estimated Useful Lives for Property and Equipment

We provide for depreciation and amortization primarily using the straight-line method by charges to the consolidated statements of income in amounts that allocate the cost of property and equipment over their estimated useful lives as follows:

Asset Classification	Estimated Useful Life
Land improvements	15 to 20 years
Buildings and improvements	10 to 40 years
Leasehold improvements	Shorter of remaining lease term or useful life of improvements
Machinery and equipment	3 to 8 years
Office furniture and equipment	3 to 7 years
Computer hardware and software	3 to 7 years

Schedule of Property and Equipment

Property and equipment, net, consisted of the following:

(in thousands)	December 31, 2020		December 31, 2019
Land and improvements	$	13,982	$	8,725
Buildings and improvements	319,384		249,918
Leasehold improvements	82,459		74,602
Machinery and equipment	353,301		322,814
Office furniture and equipment	67,527		53,210
Computer hardware and software	265,664		240,406
Construction in progress	39,764		103,200
	1,142,081		1,052,875
Less accumulated depreciation and amortization	586,914		519,030
Total property and equipment, net	$	555,167	$	533,845

Summary of Depreciation and Amortization, Capitalized Computer Software for Internal Use and Unpaid Property Equipment Reflected in Accounts Payable and Accrued Expenses

Below are the amounts of depreciation and amortization of property and equipment, capitalized computer software for internal use, unpaid property and equipment reflected in accounts payable and accrued expenses, and rental and reagent rental program instruments transferred from inventory to property and equipment:

	For the Years Ended December 31,
(in thousands)	2020		2019		2018
Depreciation and amortization expense	$	86,095	$	78,495	$	74,208
Capitalized computer software developed for internal use	$	18,472	$	20,130	$	17,115
Unpaid property and equipment, reflected in accounts payable and accrued liabilities	$	13,343	$	24,688	$	17,894
Rental and operating-type reagent rental program instruments transferred from inventory to property and equipment (Note 3)	$	9,645	$	14,498	$	20,360