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Employee Benefit Plans: (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Schedule of components of net periodic benefit costs, before allocation to the overhead pool, for Registrant's pension plan, postretirement plan, and SERP
The components of net periodic benefit costs for Registrant’s pension plan, postretirement plan and SERP for the three months ended March 31, 2019 and 2018 were as follows:
 
 
For The Three Months Ended March 31,
 
 
Pension Benefits
 
Other
Postretirement
Benefits
 
SERP
(dollars in thousands)
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Components of Net Periodic Benefits Cost:
 
 

 
 

 
 

 
 

 
 

 
 

Service cost
 
$
1,234

 
$
1,401

 
$
53

 
$
57

 
$
298

 
$
274

Interest cost
 
2,131

 
1,921

 
80

 
72

 
267

 
222

Expected return on plan assets
 
(2,593
)
 
(2,791
)
 
(112
)
 
(123
)
 
—

 
—

Amortization of prior service cost (benefit)
 
109

 
—

 
—

 
—

 
—

 
—

Amortization of actuarial (gain) loss
 
359

 
345

 
(150
)
 
(182
)
 
118

 
262

Total expense recognized, before surcharges and allocation to overhead pool
 
$
1,240

 
$
876

 
$
(129
)
 
$
(176
)
 
$
683

 
$
758