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Employee Benefit Plan (Tables)
9 Months Ended
Sep. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of net periodic benefit cost and other comprehensive income
Components of Net periodic Benefit Cost

 
Pension Benefits
Three Months Ended
 
Life and Health
Three Months Ended
 
SERP Benefits
Three Months Ended
(in thousands)
9/30/2017

 
9/30/2016

 
9/30/2017

 
9/30/2016

 
9/30/2017

 
9/30/2016

Service cost
$
0

 
$
0

 
$
48

 
$
64

 
$
42

 
$
43

Interest cost
625

 
618

 
67

 
71

 
213

 
208

Expected return on plan assets
(1,293
)
 
(1,211
)
 
0

 
0

 
0

 
0

Amortization of net retirement plan actuarial loss
269

 
244

 
9

 
1

 
100

 
90

Amortization of net retirement plan prior service (credit) cost
(3
)
 
(4
)
 
(15
)
 
4

 
22

 
19

Net periodic benefit (income) cost
$
(402
)
 
$
(353
)
 
$
109

 
$
140

 
$
377

 
$
360


  
Components of Net periodic Benefit Cost

 
Pension Benefits
Nine Months Ended
 
Life and Health
Nine Months Ended
 
SERP Benefits
Nine Months Ended
(in thousands)
9/30/2017

 
9/30/2016

 
9/30/2017

 
9/30/2016

 
9/30/2017

 
9/30/2016

Service cost
$
0

 
$
0

 
$
144

 
$
193

 
$
125

 
$
128

Interest cost
1,875

 
1,855

 
201

 
212

 
639

 
624

Expected return on plan assets
(3,816
)
 
(3,633
)
 
0

 
0

 
0

 
0

Amortization of net retirement plan actuarial loss
806

 
731

 
26

 
4

 
299

 
269

Amortization of net retirement plan prior service cost (credit)
(8
)
 
(11
)
 
(47
)
 
12

 
65

 
56

Net periodic benefit (income) cost
$
(1,143
)
 
$
(1,058
)
 
$
324

 
$
421

 
$
1,128

 
$
1,077