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Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2011
Retirement Plans [Abstract]  
Change in Benefit Obligation
  PensionPostretirement PensionPostretirement
  Plan Plan  Plan Plan
  20112011 20102010
  ($ in Thousands)
Change in Fair Value of Plan Assets         
Fair value of plan assets at beginning of year$ 159,791$ - $ 133,554$ -
Actual return on plan assets  (2,481)  -   14,477  -
Employer contributions  26,000  502   20,000  610
Gross benefits paid  (9,888)  (502)   (8,240)  (610)
 Fair value of plan assets at end of year$ 173,422$ - $ 159,791$ -
Change in Benefit Obligation         
Net benefit obligation at beginning of year$ 129,114$ 4,150 $ 119,935$ 4,429
Service cost  9,898  -   9,622  -
Interest cost  6,414  198   6,377  227
Actuarial loss  1,308  123   1,420  104
Gross benefits paid  (9,888)  (502)   (8,240)  (610)
 Net benefit obligation at end of year$ 136,846$ 3,969 $ 129,114$ 4,150
Funded (unfunded) status$ 36,576$ (3,969) $ 30,677$ (4,150)
Noncurrent assets$ 39,802$ - $ 31,274$ -
Current liabilities  -  (495)   -  (587)
Noncurrent liabilities  (3,226)  (3,474)   (597)  (3,563)
Asset (Liability) Recognized in the Consolidated Balance Sheets$ 36,576$ (3,969) $ 30,677$ (4,150)
AOCI Components
Amounts recognized in accumulated other comprehensive income (loss), net of tax, as of December 31, 2011 and 2010 follow.
           
  PensionPostretirement PensionPostretirement
  Plan Plan  Plan Plan
  20112011 20102010
  ($ in Thousands)
Prior service cost$ 274$ 103 $ 320$ 347
Net actuarial (gain) loss  32,932  (135)   24,050  (212)
Amount not yet recognized in net periodic benefit cost, but          
 recognized in accumulated other comprehensive income$ 33,206$ (32) $ 24,370$ 135
Changes in OCI
Other changes in plan assets and benefit obligations recognized in other comprehensive income (“OCI”), net of tax, in 2011 and 2010 were as follows.
           
  Pension PlanPostretirement Plan Pension PlanPostretirement Plan
  20112011 20102010
  ($ in Thousands)
Net gain (loss)$ (16,711)$ (123) $ 777$ (104)
Amortization of prior service cost  72  395   72  395
Amortization of actuarial gain (loss)  2,024  -   1,601  (3)
Income tax (expense) benefit  5,780  (106)   (995)  (111)
 Total Recognized in OCI$ (8,835)$ 166 $ 1,455$ 177
Net period benefit cost for the pension and postretirement plans
The components of net periodic benefit cost for the Pension and Postretirement Plans for 2011, 2010, and 2009 were as follows. 
                 
  PensionPostretirementPensionPostretirementPensionPostretirement
  PlanPlanPlanPlanPlanPlan
  201120112010201020092009
       ($ in Thousands)     
Service cost$ 9,898$ - $ 9,622$ - $ 8,649$ - 
Interest cost  6,414  198   6,377  227   6,262  261 
Expected return on plan assets  (12,896)  -   (12,152)  -   (11,520)  - 
Amortization of:               
 Prior service cost  72  395   72  395   72  395 
 Actuarial (gain) loss  2,024  -   1,601  (3)   551  (54) 
Total net periodic benefit cost$ 5,512$ 593 $ 5,520$ 619 $ 4,014$ 602 
Weighted Average Benefit Assumptions
  Pension PlanPostretirement PlanPension PlanPostretirement Plan
  2011201120102010
Weighted average assumptions used to determine         
 benefit obligations:        
Discount rate4.90%4.90%5.10%5.10%
Rate of increase in compensation levels5.00 N/A 5.00 N/A 
Weighted average assumptions used to determine net         
 periodic benefit costs:        
Discount rate5.10%5.10%5.50%5.50%
Rate of increase in compensation levels5.00 N/A 5.00 N/A 
Expected long-term rate of return on plan assets7.75 N/A 8.00 N/A 
Plan Asset Allocation Percentages
Asset Category20112010
Equity securities65%64%
Debt securities34 35 
Other1 1 
 Total100%100%
Pension Plan Investments
    Fair Value Measurements Using
  December 31, 2011Level 1 Level 2 Level 3
  ($ in Thousands)
Pension Plan Investments:        
Money market account$1,690$1,690$ -$ -
Mutual funds 92,026  92,026  -  -
Common /collective trust funds 79,706  -  79,706  -
 Total Pension Plan Investments$173,422$93,716$79,706$ -
          
    Fair Value Measurements Using
  December 31, 2010Level 1 Level 2 Level 3
  ($ in Thousands)
Pension Plan Investments:        
Money market account$861$861$ -$ -
Mutual funds 78,046 78,046  -  -
Common /collective trust funds  80,884  -  80,884  -
 Total Pension Plan Investments$159,791$78,907$80,884$ -
Expected Benefit Payments
 Pension Plan Postretirement Plan
 ($ in Thousands) 
Estimated future benefit payments:      
2012$13,604 $495 
2013 10,361  458 
2014 10,483  393 
2015 11,892  355 
2016 12,044  308 
2017-2021$64,502 $1,282 
One Percentage Point Change in Assumed Health Care Cost
 2011 2010
 100 bp Increase  100 bp Decrease  100 bp Increase  100 bp Decrease
 ($ in Thousands)
Effect on total of service and interest cost$15 $(13) $17 $(16)
Effect on postretirement benefit obligation$305 $(266) $343 $(317)