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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2015 and 2014: 
 
Dollars in Thousands
 
Beginning
Balance
 
Additions
 
Deductions
 
Ending
Balance
Three Months Ended June 30, 2015
$
9,193

 
$
1,198

 
$
(1,965
)
 
$
8,426

Three Months Ended June 30, 2014
$
3,540

 
$
850

 
$
(349
)
 
$
4,041

Six Months Ended June 30, 2015
$
7,947

 
$
2,730

 
$
(2,251
)
 
$
8,426

Six Months Ended June 30, 2014
$
3,838

 
$
1,523

 
$
(1,320
)
 
$
4,041
Allowance for obsolete inventory rollforward
The following is a summary of activity for the allowance for obsolete inventory during the three and six months ended June 30, 2015 and 2014: 
 
Dollars in Thousands
 
Beginning
Balance
 
Additions
 
Deductions
 
Ending
Balance
Three Months Ended June 30, 2015
$
601

 
$
328

 
$
(8
)
 
$
921

Three Months Ended June 30, 2014
$
849

 
$
—

 
$
(6
)
 
$
843

Six Months Ended June 30, 2015
$
628

 
$
328

 
$
(35
)
 
$
921

Six Months Ended June 30, 2014
$
799

 
$
55

 
$
(11
)
 
$
843
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