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Pension Plans and Other Postretirement Benefits (Details-4)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
concentration
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Other postretirement benefits [Abstract]      
Fair value of plan assets $ 330,886 $ 327,500  
Real Estate [Member]      
Other postretirement benefits [Abstract]      
Fair value of plan assets $ 27,231 $ 23,480  
Pension Benefits [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation 100.00%    
Actual Plan Asset Allocation 100.00% 100.00%  
Other postretirement benefits [Abstract]      
Fair value of plan assets $ 290,716 $ 288,548 $ 277,398
Pension Benefits [Member] | Plan Assets [Member]      
Concentration of Credit Risk [Abstract]      
Concentration risk, percentage 10.00%    
Concentration risk, number of significant concentrations | concentration 0    
Pension Benefits [Member] | Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation [1] 63.00%    
Actual Plan Asset Allocation 63.00% 62.00%  
Pension Benefits [Member] | United States Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation 45.50%    
Pension Benefits [Member] | Non-United States Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation 17.50%    
Pension Benefits [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation 30.00%    
Actual Plan Asset Allocation 29.00% 31.00%  
Pension Benefits [Member] | Real Estate [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Target Plan Asset Allocation 7.00%    
Actual Plan Asset Allocation 8.00% 7.00%  
Postretirement Benefits [Member]      
Other postretirement benefits [Abstract]      
Fair value of plan assets $ 40,170 $ 38,952 $ 37,602
Postretirement Benefits [Member] | Plan Assets [Member]      
Concentration of Credit Risk [Abstract]      
Concentration risk, percentage 10.00%    
Concentration risk, number of significant concentrations | concentration 0    
Master Pension Trust [Member]      
Other postretirement benefits [Abstract]      
Fair value of plan assets $ 34,100 $ 32,800  
[1] Target allocations for equity securities are broken out as follows: 45.5 % United States equity, 17.5 % non-United States equity .