Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2019

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, 2019		December 31, 2018
Land and improvements	$	8,725	$	8,701
Buildings and improvements	249,918		190,809
Leasehold improvements	74,602		66,917
Machinery and equipment	322,814		299,204
Office furniture and equipment	53,210		51,661
Computer hardware and software	240,406		218,150
Construction in progress	103,200		70,561
	1,052,875		906,003
Less accumulated depreciation and amortization	519,030		468,733
Total property and equipment, net	$	533,845	$	437,270

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)	2019		2018		2017
Depreciation and amortization expense	$	78,495	$	74,208	$	73,797
Capitalized computer software developed for internal use	$	20,130	$	17,115	$	16,131
Unpaid property and equipment, reflected in accounts payable and accrued liabilities	$	24,688	$	17,894	$	11,744
Rental and operating-type reagent rental program instruments transferred from inventory to property and equipment (Note 3)	$	14,498	$	20,360	$	16,313