Quarterly report pursuant to Section 13 or 15(d)

Employee Retirement Plans (Details)

v3.19.1
Employee Retirement Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Pension plan    
Components of net periodic cost:    
Service cost   $ 102
Interest cost $ 410 389
Expected return on plan assets (294) (475)
Amortization of net (gain) loss 149 176
Net periodic pension cost 265 192
Employer contributions during the period 0 14
Pension plan | Minimum    
Components of net periodic cost:    
Estimated total required contributions 0  
Other postretirement benefit cost    
Components of net periodic cost:    
Service cost 37 47
Interest cost 63 58
Amortization of net (gain) loss (78) (52)
Net periodic pension cost $ 22 $ 53