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Benefit Plan (Tables)
 12 Months Ended
Dec. 31, 2015
Benefit Plan  
Schedule of voluntary employer matching contributions

 

 

 

 

 

 

 

 

 

 

 

 

 

Year Ended December 31,

 

 

    

2015

    

2014

    

2013

 

Voluntary employer matching contributions

 

$
1,521

 

$
1,176

 

$
891