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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
 
Components of Net Periodic Benefit Cost for the Three Months Ended March 31,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pension Benefits
 
 
Supplemental Insurance/

Retirement Plan
 
 
 
2019
 
 
2018
 
 
2019
 
 
2018
 
 
 
(in thousands)
 
Service cost
 
$
276
 
 
$
353
 
 
$
256
 
 
$
277
 
Interest
 
 
473
 
 
 
370
 
 
 
482
 
 
 
346
 
Expected return on plan assets
 
 
(819
)
 
 
(954
)
 
 
—
 
 
 
—
 
Recognized prior service cost (benefit)
 
 
—
 
 
 
(25
)
 
 
28
 
 
 
29
 
Recognized net actuarial losses
 
 
229
 
 
 
227
 
 
 
109
 
 
 
176
 
Net periodic benefit (credit) cost
 
$
159
 
 
$
(29
)
 
$
875
 
 
$
828