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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 9 Months Ended
Sep. 30, 2014
Accounting Policies [Abstract]  
Allowance for doubtful accounts rollforward
The following is a summary of activity for the allowance for doubtful accounts during the three and nine months ended September 30, 2014 and 2013: 
 
Dollars in Thousands
 
Beginning
Balance
 
Additions
 
Deductions
 
Ending
Balance
Three Months Ended September 30, 2014
$
4,041

 
$
1,129

 
$
(400
)
 
$
4,770

Three Months Ended September 30, 2013
$
2,362

 
$
2,769

 
$
(1,086
)
 
$
4,045

Nine Months Ended September 30, 2014
$
3,838

 
$
2,652

 
$
(1,720
)
 
$
4,770

Nine Months Ended September 30, 2013
$
2,171

 
$
4,966

 
$
(3,092
)
 
$
4,045
Allowance for obsolete inventory rollforward
The following is a summary of activity for the allowance for obsolete inventory during the three and nine months ended September 30, 2014 and 2013: 
 
Dollars in Thousands
 
Beginning
Balance
 
Additions
 
Deductions
 
Ending
Balance
Three Months Ended September 30, 2014
$
843

 
$
6

 
$
(211
)
 
$
638

Three Months Ended September 30, 2013
$
593

 
$
19

 
$
(3
)
 
$
609

Nine Months Ended September 30, 2014
$
799

 
$
61

 
$
(222
)
 
$
638

Nine Months Ended September 30, 2013
$
616

 
$
19

 
$
(26
)
 
$
609
Schedule of property and equipment, useful lives
Depreciation is computed using the straight-line method over the estimated useful lives of the related assets as follows:
 
Leasehold improvements
1 to 10 years
Furniture and fixtures
3 to 7 years
Production equipment
3 to 7 years
Computer equipment
3 to 7 years
Research and development equipment
2 to 7 years