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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 9 Months Ended
Sep. 30, 2015
Accounting Policies [Abstract]  
Summary of activity for the allowance for doubtful accounts
The following is a summary of activity for the allowance for doubtful accounts during the three and nine months ended September 30, 2015 and 2014: 
 
Dollars in Thousands
 
Beginning
Balance
 
Additions
 
Deductions
 
Ending
Balance
Three Months Ended September 30, 2015
$
8,158

 
$
1,057

 
$
(175
)
 
$
9,040

Three Months Ended September 30, 2014
$
3,700

 
$
1,158

 
$
(400
)
 
$
4,458

Nine Months Ended September 30, 2015
$
7,679

 
$
3,787

 
$
(2,426
)
 
$
9,040

Nine Months Ended September 30, 2014
$
3,497

 
$
2,681

 
$
(1,720
)
 
$
4,458
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