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Retirement Benefit Plans (Schedule of Changes in Plan Assets, Changes in Projected Benefit Obligation, Rate Assumptions, and Components of Net Periodic Benefit Costs) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Change in fair value of plan assets    
Fair value of plan assets at end of year $ 21,838 $ 18,892
Pension Plans, Defined Benefit
    
Change in projected benefit obligation    
Benefit obligation at beginning of year 29,692 25,938
Service cost 14 12
Interest cost 1,199 1,327
Liability actuarial (gain)/loss 2,168 3,749
Benefits paid (1,364) (1,334)
Benefit obligation at end of year 31,709 29,692
Change in fair value of plan assets    
Fair value of plan assets at beginning of year 18,900 18,788
Return on plan assets 2,659 (138)
Employer contributions 1,643 1,584
Fair value of plan assets at end of year 21,838 18,900
Underfunded status – December 31, 2012 (9,871) (10,792)
Accumulated benefit obligation – December 31, 2012 31,709 29,692
Supplemental Employee Retirement Plans, Defined Benefit
    
Change in projected benefit obligation    
Benefit obligation at beginning of year 2,584 0
Service cost 101 108
Interest cost 104 103
Liability actuarial (gain)/loss 268 409
Plan Amendments 0 1,964
Benefit obligation at end of year 3,057 2,584
Hourly Employees’ Pension Plan | Pension Plans, Defined Benefit
    
Change in projected benefit obligation    
Benefit obligation at beginning of year 10,454 9,511
Service cost 10 8
Interest cost 411 469
Liability actuarial (gain)/loss 549 1,098
Benefits paid (638) (632)
Benefit obligation at end of year 10,786 10,454
Change in fair value of plan assets    
Fair value of plan assets at beginning of year 6,663 6,303
Return on plan assets 937 (73)
Employer contributions 728 1,065
Fair value of plan assets at end of year 7,690 6,663
Underfunded status – December 31, 2012 (3,096) (3,791)
Accumulated benefit obligation – December 31, 2012 10,786 10,454
Employees’ Retirement Plan | Pension Plans, Defined Benefit
    
Change in projected benefit obligation    
Benefit obligation at beginning of year 19,238 16,427
Service cost 4 4
Interest cost 788 858
Liability actuarial (gain)/loss 1,619 2,651
Benefits paid (726) (702)
Benefit obligation at end of year 20,923 19,238
Change in fair value of plan assets    
Fair value of plan assets at beginning of year 12,237 12,485
Return on plan assets 1,722 (65)
Employer contributions 915 519
Fair value of plan assets at end of year 14,148 12,237
Underfunded status – December 31, 2012 (6,775) (7,001)
Accumulated benefit obligation – December 31, 2012 $ 20,923 $ 19,238