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Inventories (Tables)
 3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory Our significant components of inventory at March 31, 2019 and December 31, 2018 were as follows (in thousands):
 
March 31,
2019
 
December 31,
2018
Raw materials and parts
$
197,598

 
$
212,526

Work in process
38,206

 
39,494

Finished goods
303,275

 
302,590

Gross inventories
539,079

 
554,610

Inventory reserve
(67,438
)
 
(75,587
)
Inventories
$
471,641

 
$
479,023