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Benefit Plans Plan Assets (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 79,020,000 $ 65,084,000  
Equity Securities [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Actual plan asset allocations as a percent of toal plan assets 47.00%    
Cash and Cash Equivalents [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7,056,000 4,301,000  
Actual plan asset allocations as a percent of toal plan assets 8.00%    
Pension Plan [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 75,542,000 62,763,000 58,761,000
Pension Plan [Member] | Debt Securities [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 33,922,000 26,271,000  
Actual plan asset allocations as a percent of toal plan assets 45.00% 42.00%  
Pension Plan [Member] | Equity Securities [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 35,352,000 32,653,000  
Actual plan asset allocations as a percent of toal plan assets 47.00% 52.00%  
Pension Plan [Member] | Cash and Cash Equivalents [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6,268,000 3,839,000  
Actual plan asset allocations as a percent of toal plan assets 8.00% 6.00%  
Other Postretirement Benefit Plan [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,478,000 2,321,000 1,993,000
Other Postretirement Benefit Plan [Member] | Debt Securities [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,168,000 938,000  
Actual plan asset allocations as a percent of toal plan assets 33.00% 40.00%  
Other Postretirement Benefit Plan [Member] | Equity Securities [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,522,000 921,000  
Actual plan asset allocations as a percent of toal plan assets 44.00% 40.00%  
Other Postretirement Benefit Plan [Member] | Cash and Cash Equivalents [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 788,000 $ 462,000  
Actual plan asset allocations as a percent of toal plan assets 23.00% 20.00%