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Pension plan and 401(k) Program (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The following table sets forth the components of net periodic cost for our pension plan:
Components of net periodic benefit cost
($ in thousands)
 
($ in thousands)
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2019
 
2018
 
2019
 
2018
Service cost
$
638

 
$
718

 
$
1,900

 
$
1,624

Interest cost
62

 
66

 
183

 
149

Expected return on plan assets
(177
)
 
(244
)
 
(526
)
 
(552
)
Amortization of:
 
 
 
 
 
 
 
Prior service (benefit)
(5
)
 
(6
)
 
$
(14
)
 
(14
)
Net actuarial loss
49

 
—

 
$
146

 
—

Participant contributions
(196
)
 
(217
)
 
$
(584
)
 
(491
)
Net periodic benefit cost
$
371

 
$
317

 
$
1,105

 
$
716