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Property and Equipment:
6 Months Ended
Jun. 30, 2023
Property, Plant and Equipment [Abstract]  
Property and Equipment [Text Block] Property, Plant and Equipment
Property, plant and equipment consists of the following (in thousands): 
As of
 June 30, 2023December 31, 2022
Machinery and equipment$449,210 $414,811 
Land, building and building improvements276,062 274,063 
Molds79,845 77,203 
Computer equipment and software120,805 115,214 
Furniture and fixtures30,309 29,876 
Instruments placed with customers(1)
107,281 98,481 
Construction in progress127,795 152,909 
Total property, plant and equipment, cost1,191,307 1,162,557 
Accumulated depreciation(574,767)(526,444)
Property, plant and equipment, net$616,540 $636,113 
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(1)    Instruments placed with customers consist of drug-delivery and monitoring systems placed with customers under operating leases.

Depreciation expense was $24.4 million and $47.8 million for the three and six months ended June 30, 2023, respectively, and $24.9 million and $46.4 million for the three and six months ended June 30, 2022, respectively.