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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 3 Months Ended
Mar. 31, 2015
Accounting Policies [Abstract]  
Allowance for doubtful accounts rollforward
The following is a summary of activity for the allowance for doubtful accounts during the three months ended March 31, 2015 and 2014: 
 
Dollars in Thousands
 
Beginning
Balance
 
Additions
 
Deductions
 
Ending
Balance
Three Months Ended March 31, 2015
$
7,947

 
$
1,532

 
$
(286
)
 
$
9,193

Three Months Ended March 31, 2014
$
3,838

 
$
673

 
$
(971
)
 
$
3,540
Allowance for obsolete inventory rollforward
The following is a summary of activity for the allowance for obsolete inventory during the three months ended March 31, 2015 and 2014: 
 
Dollars in Thousands
 
Beginning
Balance
 
Additions
 
Deductions
 
Ending
Balance
Three Months Ended March 31, 2015
$
628

 
$
—

 
$
(27
)
 
$
601

Three Months Ended March 31, 2014
$
799

 
$
55

 
$
(5
)
 
$
849
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