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Stock Based Compensation
3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Based Compensation
Stock Based Compensation — Compensation expense associated with RSUs and restricted stock was recognized based on the fair value of the instruments, over the instruments’ vesting period. The following table reflects the statements of income line items for stock based compensation expense for the periods stated:
 
 
For the Three Months Ended March 31,
Operating Expense Category
 
2015
 
2014
 
 
(Dollars in thousands)
Cost of revenue
 
$
34

 
$
81

Service, rental and maintenance
 
29

 
39

Selling and marketing
 
51

 
131

General and administrative
 
329

 
835

Total stock based compensation
 
$
443

 
$
1,086



The decrease in stock based compensation expense during the three months ended March 31, 2015, compared to the same period in 2014, was due to the 2015 LTIP as compared to the 2011 LTIP, which fully vested on December 31, 2014. Fewer RSUs were granted under the 2015 LTIP resulting in lower stock based compensation expense in 2015.