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Benefit Plans
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Benefit Plans Retirement Plans and Postretirement Benefits
The components of our consolidated net pension costs are set forth in the following table:
For the Three Months
Ended June 30,		For the Six Months
Ended June 30,
2020201920202019
 (Dollars in thousands)
Service cost$618  $575  $1,240  $1,150  
Interest cost1,032  1,316  2,065  2,632  
Expected return on plan assets(1,282) (1,338) (2,566) (2,676) 
Net cost$368  $553  $739  $1,106  
The components of our consolidated net postretirement costs are set forth in the following table: 
For the Three Months
Ended June 30,		For the Six Months
Ended June 30,
2020201920202019
 (Dollars in thousands)
Interest cost$174  $239  365  481  
Net cost$174  $239  $365  $481