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SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN (Tables)
6 Months Ended
Jun. 30, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Components of net periodic pension cost
The components of net periodic pension cost were as follows (in thousands):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2015
 
2014
 
2015
 
2014
Service cost
 
$
319

 
$
167

 
$
548

 
$
334

Interest cost
 
166

 
106

 
286

 
212

Amortization of prior service cost
 
436

 
146

 
678

 
292

Total net periodic benefit cost
 
$
921

 
$
419

 
$
1,512

 
$
838