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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Retirement Benefits [Abstract]  
Actuarial Assumptions Used to Determine the Actuarial Present Value of Projected Benefit Obligations
The following table presents the weighted average actuarial assumptions used to determine the actuarial present value of projected benefit obligations at:
 
DECEMBER 31,
 
2017
 
2016
Discount rate
3.25
%
 
4.00
%
Rate of future compensation increase
2.90
%
 
3.60
%
Actuarial Assumptions Used to Determine Net Periodic Benefit Cost
The following table presents the weighted average actuarial assumptions used to determine net periodic benefit cost for the years ended:
 
DECEMBER 31,
 
2017
 
2016
 
2015
Discount rate
4.00
%
 
4.00
%
 
3.75
%
Rate of future compensation increase
3.60
%
 
4.00
%
 
4.00
%
Components of Net Periodic Benefit Cost
The following table presents the components of net periodic benefit cost for the years ended (in thousands):
 
DECEMBER 31,
 
2017
 
2016
 
2015
Service cost
$
319

 
$
1,310

 
$
1,323

Interest cost
537

 
453

 
383

Net periodic benefit cost
$
856

 
$
1,763

 
$
1,706
Changes in the Benefit Obligation
The following table presents the changes in the projected benefit obligation for the years ended (in thousands):
 
DECEMBER 31,
 
2017
 
2016
Projected benefit obligation, beginning
$
13,436

 
$
11,337

Service cost
319

 
1,310

Interest cost
537

 
453

Actuarial experience and changes in actuarial assumptions
117

 
336

Projected benefit obligation, ending
$
14,409

 
$
13,436
Projected Annual Benefit Payment
Undiscounted benefit payments by the SERP, which reflect the anticipated future service of participants, expected to be paid are as follows (in thousands):
 
PROJECTED ANNUAL
BENEFIT PAYMENTS
2018
$
—

2019
—

2020
—

2021
12,788

2022
—

2023-2027
—

Thereafter
4,282