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Pension Plans and Other Postretirement Benefits (Details-2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year $ 244,401    
Fair value of plan assets at end of year 315,000    
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation 100.00%    
Actual Plan Asset Allocation 100.00% 100.00%  
Plan Assets [Member]
     
Concentration of Credit Risk [Abstract]      
Concentration risk, percentage 10.00%    
Concentration risk, number of significant concentrations 0    
Equity Securities [Member]
     
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation 63.00%    
Actual Plan Asset Allocation 66.00% 64.00%  
United States Equity Securities [Member]
     
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation 45.50%    
Non-United States Equity Securities [Member]
     
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation 17.50%    
Debt securities [Member]
     
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation 30.00%    
Actual Plan Asset Allocation 28.00% 29.00%  
Real Estate [Member]
     
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 17,141    
Fair value of plan assets at end of year 19,628    
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation 7.00%    
Actual Plan Asset Allocation 6.00% 7.00%  
Pension Benefits [Member]
     
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 212,277 173,311  
Actual return on plan assets 45,816 27,511  
Employer contributions 30,878 20,815  
Plan participants' contributions 0 0  
Gross benefits paid (11,573) (9,360)  
Fair value of plan assets at end of year 277,398 212,277 173,311
Weighted-average assumptions used to determine net periodic cost:      
Long-term rate of return 8.10% 8.10% 8.25%
Postretirement Benefits [Member]
     
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 32,124 23,456  
Actual return on plan assets 5,000 3,046  
Employer contributions 2,811 8,059  
Plan participants' contributions 665 718  
Gross benefits paid (2,998) (3,155)  
Fair value of plan assets at end of year $ 37,602 $ 32,124 $ 23,456
Weighted-average assumptions used to determine net periodic cost:      
Long-term rate of return 6.79% 7.26% 7.39%