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Retirement Plans (Table)
6 Months Ended
Jun. 30, 2012
Compensation and Retirement Disclosure [Abstract]  
Retirement Income Plan and Retirement Life Plan
 
 
Retirement Income Plan
Quarter ended June 30,
 
Retirement Life Plan
Quarter ended June 30,
($ in thousands)
 
2012
 
2011
 
2012
 
2011
Components of Net Periodic Benefit Cost:
 
 

 
 

 
 

 
 

Service cost
 
$
2,154

 
2,174

 

 

Interest cost
 
3,230

 
3,155

 
74

 
76

Expected return on plan assets
 
(3,547
)
 
(3,481
)
 

 

Amortization of unrecognized prior service cost
 
37

 
38

 

 

Amortization of unrecognized net loss
 
1,383

 
1,099

 
8

 
5

Net periodic cost
 
$
3,257

 
2,985

 
82

 
81

 
 
Retirement Income Plan
Six Months ended June 30,
 
Retirement Life Plan
Six Months ended June 30,
($ in thousands)
 
2012
 
2011
 
2012
 
2011
Components of Net Periodic Benefit Cost:
 
 

 
 

 
 

 
 

Service cost
 
$
4,308

 
4,347

 

 

Interest cost
 
6,460

 
6,310

 
148

 
153

Expected return on plan assets
 
(7,094
)
 
(6,963
)
 

 

Amortization of unrecognized prior service cost
 
75

 
75

 

 

Amortization of unrecognized net loss
 
2,766

 
2,200

 
15

 
9

Net periodic cost
 
$
6,515

 
5,969

 
163

 
162

Weighted-Average Expense Assumptions
Weighted-Average Expense Assumptions for the years ended December 31:
 
 

 
 
 
 

 
 
Discount rate
 
5.16
%
 
5.55
 
5.16
%
 
5.55
Expected return on plan assets
 
7.75
%
 
8.00
 

 
Rate of compensation increase
 
4.00
%
 
4.00