XML 29 R57.htm IDEA: XBRL DOCUMENT v2.4.0.8
Benefit Plans Narrative (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Y
Dec. 31, 2012
Dec. 31, 2011
Pension Plans [Abstract]      
Number of compensation years included in benefit calculation 3    
Expected future working lifetime of participants 12 years 2 months 27 days    
Market gains (losses) $ (334,000) $ 649,000  
Return on investments since plan inception, percent 11.20%    
Investments benchmark since inception, percent 10.40%    
Return on investments for 2012, percent 14.70%    
Investments benchmark for 2012, percent 11.90%    
Flexible Spending Plan [Abstract]      
Annual maximum contribution limit under Health Care Spending Account plan 2,500.0    
Annual maximum contribution limit under Dependent Care Spending Account plan 5,000    
Deferral Plan [Abstract]      
Employer contributions to deferral plan 1,087,000 1,044,000 1,001,000
Fixed Income Funds [Member]
     
Pension Plans [Abstract]      
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 25.00%    
Bonds [Member]
     
Pension Plans [Abstract]      
Actual plan asset allocations 38.00%    
Cash and Cash Equivalents [Member]
     
Pension Plans [Abstract]      
Actual plan asset allocations 9.00%    
Equity Securities [Member]
     
Pension Plans [Abstract]      
Actual plan asset allocations 53.00%    
Minimum [Member]
     
Pension Plans [Abstract]      
Period for performance standards 3 years    
Maximum [Member]
     
Pension Plans [Abstract]      
Period for performance standards 5 years    
Maximum [Member] | Private Corporation Assets [Member]
     
Pension Plans [Abstract]      
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 5.00%    
Executive Supplemental Retirement Plan [Member]
     
Pension Plans [Abstract]      
Projected benefit obligation 12,637,000 13,130,000  
Net periodic pension cost 1,248,000 1,386,000 1,241,000
Executives and Non-employee Directors [Member] | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member]
     
Special Deferral Election Plan and Deferral Election Program [Abstract]      
Deferrals by executives and non-employee directors $ 2,567,000 $ 2,501,000 $ 2,306,000