Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, plant, and equipment at December 31, 2018 and 2017 consists of the following:

(In thousands)	2018		2017		Estimated useful lives in years
Land	$	21,913	$	16,795
Buildings and improvements	185,175		174,615		5-35
Manufacturing equipment	298,529		274,723		5-10
Canisters and cylinders	90,790		77,325		3-12
Molds	72,089		80,198		3-5
Office furniture and equipment	142,818		121,345		3-8
Construction in progress	69,437		42,288
Total property, plant and equipment	880,751		787,289
Less accumulated depreciation	461,222		427,766
Property, plant and equipment, net	$	419,529	$	359,523

Depreciation Expense

The table below sets forth the depreciation expense for the years ended December 31, 2018, 2017 and 2016:

(In thousands)	2018		2017		2016
Depreciation expense	$	65,116	$	58,208	$	55,623