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Pension plan and 401(k) Program (Tables)
 6 Months Ended
Jun. 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
 
Six Months Ended
 
June 30,
 
June 30,
 
2019
 
2018
 
2019
 
2018
Service cost
$
629

 
$
352

 
$
1,261

 
$
909

Interest cost
61

 
32

 
122

 
83

Expected return on plan assets
(174
)
 
(120
)
 
(349
)
 
(309
)
Amortization of:
 
 
 
 
 
 
 
Prior service (benefit)
(5
)
 
(3
)
 
$
(10
)
 
(8
)
Net actuarial loss
48

 
—

 
$
97

 
—

Participant contributions
(193
)
 
(106
)
 
$
(387
)
 
(274
)
Net periodic benefit cost
$
366

 
$
155

 
$
734

 
$
401