Annual report pursuant to Section 13 and 15(d)

Employee Retirement Plans (Details 2)

v2.4.0.8
Employee Retirement Plans (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension benefits
      
Assumptions used in determining net periodic pension cost for the plans      
Discount rates (as a percent) 4.10% 4.60% 5.50%
Rates of increase in compensation levels: Salaried (as a percent) 3.50% 3.50% 3.50%
Expected long-term rate of return on assets (as a percent) 7.25% 7.25% 8.00%
Expected long-term rate of return on plan assets for the next fiscal year 0.0725    
Expected benefit payments      
2014 $ 1,330    
2015 1,340    
2016 1,360    
2017 1,400    
2018 1,440    
2019-2023 8,250    
Required pension funding contributions made 828 2,014  
Amounts included in other comprehensive loss, net of tax      
Net actuarial gain (loss) (2,912)    
Amounts that will be amortized from accumulated other comprehensive income loss into net periodic pension or OPEB cost in the next fiscal year      
Estimated actuarial gain (loss) (202)    
Pension benefits | Minimum
      
Expected benefit payments      
Required pension funding contributions made 828    
Required pension funding contributions expected to be made in next fiscal year 1,410    
Hourly pension plans
      
Assumptions used to determine the benefit obligation      
Discount rate (as a percent) 4.90% 4.10%  
Salaried pension plans
      
Assumptions used to determine the benefit obligation      
Discount rate (as a percent) 4.80% 4.10%  
Postretirement benefits
      
Assumptions used in determining net periodic pension cost for the plans      
Discount rates (as a percent) 3.70% 4.40% 5.50%
Summary of healthcare cost trend rates      
Immediate healthcare cost trend rate (as a percent) 7.00% 8.00% 9.00%
Ultimate healthcare cost trend rate (as a percent) 4.50% 4.50% 5.00%
Participation (as a percent) 80.00% 80.00% 80.00%
Assumptions used to determine the benefit obligation      
Discount rate (as a percent) 4.50% 3.70%  
Effect of one percentage point change in the healthcare cost trend rate      
Effect on total service and interest cost, 1% increase 51    
Effect on total service and interest cost, 1% decrease (44)    
Effect on postretirement benefit obligation, 1% increase 555    
Effect on postretirement benefit obligation, 1% decrease (482)    
Amounts included in other comprehensive loss, net of tax      
Net actuarial gain (loss) 2,234    
Amounts that will be amortized from accumulated other comprehensive income loss into net periodic pension or OPEB cost in the next fiscal year      
Estimated actuarial gain (loss) $ 398    
Postretirement benefits | Under 65
      
Summary of healthcare cost trend rates      
Assumed health care cost trend rate for the next fiscal year (as a percent) 7.00% 8.00%  
Ultimate rate in 2021 (as a percent)   4.50%  
Ultimate rate in 2020 (as a percent) 4.50%    
Age of participants 65    
Postretirement benefits | Over 65
      
Summary of healthcare cost trend rates      
Assumed health care cost trend rate for the next fiscal year (as a percent) 5.00% 6.00%  
Ultimate rate in 2021 (as a percent)   4.50%  
Ultimate rate in 2020 (as a percent) 4.50%    
Age of participants 65