Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018		December 31, 2017
Land and improvements	$	8,701	$	7,323
Buildings and improvements	190,809		180,185
Leasehold improvements	66,917		52,227
Machinery and equipment	299,204		284,375
Office furniture and equipment	51,661		47,476
Computer hardware and software	218,150		206,580
Construction in progress	70,561		33,470
	906,003		811,636
Less accumulated depreciation and amortization	468,733		432,540
Total property and equipment, net	$	437,270	$	379,096

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 account payable and accrued expenses, and rental and reagent rental program instruments transferred from inventory to property and equipment:

	December 31, 2018		December 31, 2017		December 31, 2016
Depreciation and amortization expense	$	74,208	$	73,797	$	63,537
Capitalized computer software developed for internal use	$	17,115	$	16,131	$	15,590
Unpaid property and equipment, reflected in accounts payable and accrued liabilities	$	17,894	$	11,744	$	10,601
Rental and Reagent Rental Program instruments transferred from inventory to property and equipment (Note 3)	$	20,360	$	16,313	$	18,324