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Inventories
 12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories
The Company's significant components of inventory at December 31, 2016 and 2015 were as follows (in thousands):

 
December 31,
2016
 
December 31,
2015
Raw materials and parts
$
106,329

 
$
148,372

Work in process
23,303

 
38,381

Finished goods
277,303

 
315,256

Gross inventories
406,935

 
502,009

Inventory reserve
(68,352
)
 
(77,888
)
Inventories
$
338,583

 
$
424,121


The change in the amounts of the inventory reserve during the three year period ended December 31, 2016 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, 2014
 
$
26,419

 
$
8,171

 
$
(5,134
)
 
$
29,456

December 31, 2015
 
29,456

 
51,917

 
(3,485
)
 
$
77,888

December 31, 2016
 
77,888

 
25,537

 
(35,073
)
 
$
68,352