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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Defined Benefit Plan [Abstract]  
Net period benefit cost for the pension and postretirement plans
The components of net periodic benefit cost for the RAP and Postretirement Plans for three and six months ended June 30, 2017 and 2016 were as follows.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
($ in Thousands)
Components of Net Periodic Benefit Cost
 
 
 
 
 
 
 
Pension Plan:
 
 
 
 
 
 
 
Service cost
$
1,782

 
$
1,725

 
$
3,563

 
$
3,450

Interest cost
1,756

 
1,780

 
3,512

 
3,560

Expected return on plan assets
(4,882
)
 
(5,065
)
 
(9,763
)
 
(10,130
)
Amortization of prior service cost
(18
)
 
12

 
(37
)
 
25

Amortization of actuarial loss
487

 
483

 
975

 
965

Total net pension cost
$
(875
)
 
$
(1,065
)
 
$
(1,750
)
 
$
(2,130
)
Postretirement Plan:
 
 
 
 
 
 
 
Interest cost
$
24

 
$
36

 
$
48

 
$
72

Amortization of prior service cost
(19
)
 
—

 
(38
)
 
—

Total net periodic benefit cost
$
5

 
$
36

 
$
10

 
$
72