Quarterly report pursuant to Section 13 or 15(d)

Employee Retirement Plans (Details)

v3.19.3
Employee Retirement Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Pension plan        
Component of net periodic cost:        
Service cost   $ 102   $ 306
Interest cost $ 410 389 $ 1,230 1,167
Expected return on plan assets (294) (475) (882) (1,425)
Amortization of net (gain) loss 149 176 447 528
Net periodic pension cost 265 192 795 576
Employer contributions during the period     0 7,047
Discretionary contribution received     7,000  
Pension plan | Minimum        
Component of net periodic cost:        
Estimated total required contributions 0   0  
Other postretirement benefit cost        
Component of net periodic cost:        
Service cost 37 47 111 141
Interest cost 63 58 189 174
Amortization of net (gain) loss (78) (52) (234) (156)
Net periodic pension cost $ 22 $ 53 $ 66 $ 159