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Inventories
3 Months Ended
Mar. 29, 2015
Inventory Disclosure [Abstract]  
Inventories
INVENTORIES
Inventories are stated at the lower of cost or market, with cost determined by standard cost methods, which approximate the first-in, first-out method. Inventory costs include material, labor and manufacturing overhead. Service inventories that exceed the estimated requirements for the next 12 months based on recent usage levels are reported as a long-term asset. Management has established inventory reserves based on estimates of excess and/or obsolete current and non-current inventory.
Inventories consisted of the following (in thousands):
 
March 29,
2015
 
December 31,
2014
Raw materials and assembled parts
$
55,373

 
$
61,644

Service inventories, estimated current requirements
11,992

 
12,398

Work-in-process
77,171

 
76,402

Finished goods
18,966

 
25,996

Total current inventories
$
163,502

 
$
176,440

Non-current inventories
$
49,019

 
$
50,731