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Inventories
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories
The Company’s significant components of inventory at December 31, 2018 and 2017 were as follows (in thousands):

 
December 31,
2018
 
December 31,
2017
Raw materials and parts
$
212,526

 
$
160,093

Work in process
39,494

 
51,941

Finished goods
302,590

 
305,461

Gross inventories
554,610

 
517,495

Inventory reserve
(75,587
)
 
(74,318
)
Inventories
$
479,023

 
$
443,177


The change in the amounts of the inventory reserve during the three year period ended December 31, 2018 is as follows (in thousands):
Period ended
Balance at beginning of period
 
Charged to expense
 
Deductions or other
 
Balance at end of period
December 31, 2016
$
77,888

 
$
25,537

 
$
(35,073
)
 
$
68,352

December 31, 2017
68,352

 
14,620

 
(8,654
)
 
$
74,318

December 31, 2018
74,318

 
36,606

 
(35,337
)
 
$
75,587