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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Retirement Plans  
Defined Benefit Plan Disclosure [Line Items]  
Benefit costs
Our pension costs, which include costs for the qualified TRP plan and the nonqualified SERP plan, are presented in the following table (in thousands):
 
Three months ended Mar. 31,
 
2017
 
2016
 
 
 
 
Service cost-benefits earned during the period
$
125

 
$
250

Interest cost on benefit obligation
5,925

 
6,350

Expected return on plan assets
(6,650
)
 
(6,750
)
Amortization of prior service cost
150

 
150

Amortization of actuarial loss
1,975

 
1,700

Expense for company-sponsored retirement plans
$
1,525

 
$
1,700