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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Allowance for doubtful accounts rollforward
The following is a summary of activity for the allowance for doubtful accounts during the years ended December 31, 2014, 2013 and 2012:  

 
Dollars in Thousands
 
Beginning
Balance
 
Provision
 
Write Offs
 
Ending
Balance
Twelve months ended December 31, 2014
$
3,838

 
$
6,119

 
$
(2,010
)
 
$
7,947

Twelve months ended December 31, 2013
$
2,171

 
$
5,548

 
$
(3,881
)
 
$
3,838

Twelve months ended December 31, 2012
$
1,088

 
$
2,468

 
$
(1,385
)
 
$
2,171
Allowance for obsolete inventory rollforward
The following is a summary of activity for the allowance for obsolete inventory during the years ended December 31, 2014, 2013 and 2012: 
 
Dollars in Thousands
 
Beginning
Balance
 
Provision
 
Write Offs
 
Ending
Balance
Twelve months ended December 31, 2014
$
799

 
$
61

 
$
(232
)
 
$
628

Twelve months ended December 31, 2013
$
616

 
$
217

 
$
(34
)
 
$
799

Twelve months ended December 31, 2012
$
511

 
$
129

 
$
(24
)
 
$
616
Schedule of property and equipment, useful lives
Depreciation is computed by 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