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Property and Equipment:
 6 Months Ended
Jun. 30, 2019
Property, Plant and Equipment [Abstract]  
Property and Equipment [Text Block] Property and Equipment

Property and equipment consisted of the following (in thousands): 
 
June 30, 2019
 
December 31, 2018
Machinery and equipment
$
211,877

 
$
203,431

Land, building and building improvements
218,928

 
212,283

Molds
59,750

 
59,700

Computer equipment and software
81,916

 
80,420

Furniture and fixtures
7,420

 
7,409

Instruments placed with customers(1)
67,398

 
60,757

Construction in progress
81,054

 
70,864

Total property and equipment, cost
728,343

 
694,864

Accumulated depreciation
(291,423
)
 
(262,223
)
Property and equipment, net
$
436,920

 
$
432,641


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(1)Instruments placed with customers consist of drug-delivery and monitoring systems placed with customers.

Depreciation expense was $14.7 million and $29.8 million for the three and six months ended June 30, 2019, respectively, as compared to $13.6 million and $27.8 million for the three and six months ended June 30, 2018, respectively.