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Benefit Plans Reconciliation of Funded Status (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of assets at end of year $ 79,020,000 $ 65,084,000  
Pension Plan [Member]
     
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 123,904,000 102,783,000  
Service cost 4,288,000 3,516,000 3,171,000
Interest cost 5,349,000 5,313,000 5,231,000
Actuarial loss 11,090,000 15,732,000  
Benefits paid (3,632,000) (3,440,000)  
Benefit obligation at end of year 140,999,000 123,904,000 102,783,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of assets at beginning of year 62,763,000 58,761,000  
Actual return on plan assets 6,645,000 (27,000)  
Employer contributions 9,766,000 7,469,000  
Benefits paid (3,632,000) (3,440,000)  
Fair value of assets at end of year 75,542,000 62,763,000 58,761,000
Funded status at end of year (65,457,000) (61,141,000)  
Other Postretirement Benefit Plan [Member]
     
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 10,796,000 8,731,000  
Service cost 339,000 273,000 229,000
Interest cost 452,000 467,000 433,000
Actuarial loss 994,000 1,641,000  
Benefits paid (338,000) (316,000)  
Benefit obligation at end of year 12,243,000 10,796,000 8,731,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of assets at beginning of year 2,321,000 1,993,000  
Actual return on plan assets 838,000 (20,000)  
Employer contributions 596,000 567,000  
Benefits paid (277,000) (219,000)  
Fair value of assets at end of year 3,478,000 2,321,000 1,993,000
Funded status at end of year $ (8,765,000) $ (8,475,000)