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Employee Benefits
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Employee Benefits EMPLOYEE BENEFITS

Net Periodic Benefit Cost

The components of the net periodic benefit cost for our pension and postretirement benefit plans are as follows:
 
Pension Plan
 
Postretirement Benefit Plan
Three Months Ended March 31,
2019
 
2018
 
2019
 
2018
 
 
 
 
 
 
 
 
Net periodic benefit cost
 
 
 
 
 
 
 
Service cost
$
1,997

 
$
2,175

 
$
456

 
$
749

Interest cost
2,080

 
1,875

 
319

 
502

Expected return on plan assets
(2,696
)
 
(2,625
)
 
—

 
—

Amortization of prior service credit
—

 
—

 
(2,021
)
 
(1,352
)
Amortization of net loss
901

 
1,071

 
223

 
589

Net periodic benefit cost
$
2,282

 
$
2,496

 
$
(1,023
)
 
$
488


A portion of the service cost component of net periodic pension and postretirement benefit costs is capitalized and amortized as part of deferred acquisition costs and is included in the income statement line titled "amortization of deferred policy acquisition costs." The portion not related to the compensation and the other components of net periodic pension and postretirement benefit costs is included in the income statement line titled "other underwriting expenses."

Employer Contributions

We previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2018 that we expected to contribute $4,000 to the pension plan in 2019. For the three-month period ended March 31, 2019, we contributed $1,000 to the pension plan.