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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, plant and equipment at December 31, 2021 and 2020 consists of the following:
(In thousands)20212020Estimated
useful lives in
years
Land$24,000 $23,901 
Buildings and improvements281,019 238,586 
5-35
Manufacturing equipment415,985 365,511 
5-10
Canisters and cylinders142,071 120,113 
3-12
Molds77,708 76,283 
3-5
Office furniture and lab equipment189,258 165,950 
3-8
Construction in progress177,161 109,280 
Total property, plant and equipment1,307,202 1,099,624 
Less accumulated depreciation653,104 574,257 
Property, plant and equipment, net$654,098 $525,367 
Depreciation Expense The table below sets forth the depreciation expense for the years ended December 31, 2021, 2020 and 2019:
(In thousands)202120202019
Depreciation expense$90,311 $83,430 $74,975