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Inventories, Net and Significant Suppliers (Tables)
 3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Inventories, Net
Inventories, net were as follows:
(In thousands)
March 31, 2019
 
December 31, 2018

Raw materials
$
71,784

 
$
68,834

Components
16,759

 
25,071

Work in process
8,858

 
5,577

Finished goods
58,053

 
50,006

Reserve for excess and obsolete inventory
(5,488
)
 
(5,138
)
Inventories, net
$
149,966

 
$
144,350
Changes in Reserve for Excess and Obsolete Inventory
Changes in the reserve for excess and obsolete inventory were as follows:
(In thousands)
Three Months Ended March 31,
2019
 
2018
Balance at beginning of period
$
5,138

 
$
4,288

Additions charged to costs and expenses (1)
1,422

 
643

Sell through (2)
(378
)
 
(315
)
(Write-offs)/Foreign exchange effects
(694
)
 
(388
)
Balance at end of period
$
5,488

 
$
4,228


(1)
The additions charged to costs and expenses do not include inventory directly written-off that was scrapped during production totaling $1.1 million and $0.1 million for the three months ended March 31, 2019 and 2018, respectively. These amounts are production waste and are not included in management's reserve for excess and obsolete inventory.
(2)
These amounts represent the reduction in reserves associated with inventory items that were sold during the period.