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COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]  
Summary of Product Warranty Accrual
The following table summarizes changes in our product warranty accrual for the years ended December 31, 2013, 2012 and 2011 (in thousands):
 
Years Ended December 31,
 
2013
 
2012
 
2011
Beginning balance
$
1,691

 
$
3,419

 
$
2,539

Warranties issued in the period
2,031

 
2,242

 
3,577

Costs to service warranties
(1,981
)
 
(4,286
)
 
(3,263
)
Warranty accrual adjustments
45

 
316

 
566

Ending balance
$
1,786

 
$
1,691

 
$
3,419
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
We hold various operating leases related to our worldwide facilities and equipment. Our minimum annual lease commitments with respect to our operating leases were as follows as of December 31, 2013 (in thousands):
Year Ending December 31,
Minimum Future Lease Payments
 
Sublease Rental Income
 
Minimum Future Lease Payments
2014
$
3,920

 
$
(118
)
 
$
3,802

2015
3,401

 
(85
)
 
3,316

2016
1,936

 
—

 
1,936

2017
2,292

 
—

 
2,292

 
$
11,549

 
$
(203
)
 
$
11,346