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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
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,
 
2018
 
2017
Discount rate
4.00
%
 
3.25
%
Rate of future compensation increase
2.90
%
 
2.90
%
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,
 
2018
 
2017
 
2016
Discount rate
3.25
%
 
4.00
%
 
4.00
%
Rate of future compensation increase
2.90
%
 
3.60
%
 
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,
 
2018
 
2017
 
2016
Service cost
$
1,353

 
$
319

 
$
1,310

Interest cost
468

 
537

 
453

Net periodic benefit cost
$
1,821

 
$
856

 
$
1,763
Changes in the Benefit Obligation The following table presents the changes in the projected benefit obligation for the years ended (in thousands):
 
DECEMBER 31,
 
2018
 
2017
Projected benefit obligation, beginning
$
14,409

 
$
13,436

Service cost
1,353

 
319

Interest cost
468

 
537

Actuarial experience and changes in actuarial assumptions
(1,195
)
 
117

Projected benefit obligation, ending
$
15,035

 
$
14,409
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 during the years ended December 31 (in thousands):
 
PROJECTED ANNUAL
BENEFIT PAYMENTS
2019
$
—

2020
—

2021
13,351

2022
—

2023
—

2024-2027
—

Thereafter
4,409