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Pension and Other Postretirement Benefits Pension Plan Asset Allocation (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan assets $ 199,304 $ 96,234  
Actual Plan Asset Allocations 100.00% 100.00%  
U.S. Equities [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan assets 86,323 47,728  
Target Allocation Percentage Of Assets 50.00%    
Actual Plan Asset Allocations 43.00% 50.00%  
International Equities [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan assets 40,093 15,318  
Target Allocation Percentage Of Assets 15.00%    
Actual Plan Asset Allocations 20.00% 16.00%  
Fixed Income Securities [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan assets 72,888 32,734  
Target Allocation Percentage Of Assets 35.00%    
Actual Plan Asset Allocations 37.00% 34.00%  
Cash and Cash Equivalents [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan assets   454  
Other Postretirement Benefit Plans, Defined Benefit [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expected return on plan assets 0.00% 0.00% 0.00%
Fair Value of Plan assets 0 0 0
Pension Plans, Defined Benefit [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expected return on plan assets 7.25% 8.00% 8.00%
Fair Value of Plan assets $ 199,304 $ 96,234 $ 84,967