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Pension, Savings, And Other Employee Benefits (Schedule Of Fair Value Of Assets And Liabilities)(Details) - Pension Plan [Member] - USD ($)
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets $ 695,549,000 $ 640,605,000
Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 16,620,000 73,181,000
Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 678,929,000 567,424,000
Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 0 0
Cash Equivalents And Money Market Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 5,817,000 9,347,000
Cash Equivalents And Money Market Funds [Member] | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 5,817,000 9,347,000
Cash Equivalents And Money Market Funds [Member] | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 0 0
Cash Equivalents And Money Market Funds [Member] | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 0 0
Equity Securities [Member] | U S Mid And Small Capital [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 10,803,000 63,834,000
Equity Securities [Member] | U S Mid And Small Capital [Member] | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 10,803,000 63,834,000
Equity Securities [Member] | U S Mid And Small Capital [Member] | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 0 0
Equity Securities [Member] | U S Mid And Small Capital [Member] | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 0 0
Fixed Income Securities [Member] | U S Treasury Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 3,684,000 4,585,000
Fixed Income Securities [Member] | U S Treasury Securities [Member] | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 0 0
Fixed Income Securities [Member] | U S Treasury Securities [Member] | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 3,684,000 4,585,000
Fixed Income Securities [Member] | U S Treasury Securities [Member] | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 0 0
Fixed Income Securities [Member] | Foreign Corporate Debt Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 230,808,000 199,896,000
Fixed Income Securities [Member] | Foreign Corporate Debt Securities [Member] | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 0 0
Fixed Income Securities [Member] | Foreign Corporate Debt Securities [Member] | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 230,808,000 199,896,000
Fixed Income Securities [Member] | Foreign Corporate Debt Securities [Member] | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 0 0
Common And Collective Funds [Member] | U S Mid And Small Capital [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 39,449,000  
Common And Collective Funds [Member] | U S Mid And Small Capital [Member] | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 0  
Common And Collective Funds [Member] | U S Mid And Small Capital [Member] | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 39,449,000  
Common And Collective Funds [Member] | U S Mid And Small Capital [Member] | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 0  
Common And Collective Funds [Member] | Foreign Corporate Debt Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 231,666,000 205,580,000
Common And Collective Funds [Member] | Foreign Corporate Debt Securities [Member] | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 0 0
Common And Collective Funds [Member] | Foreign Corporate Debt Securities [Member] | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 231,666,000 205,580,000
Common And Collective Funds [Member] | Foreign Corporate Debt Securities [Member] | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 0 0
Common And Collective Funds [Member] | U S Large Capital [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 119,234,000 102,702,000
Common And Collective Funds [Member] | U S Large Capital [Member] | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 0 0
Common And Collective Funds [Member] | U S Large Capital [Member] | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 119,234,000 102,702,000
Common And Collective Funds [Member] | U S Large Capital [Member] | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 0 0
Common And Collective Funds [Member] | International [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 54,088,000 54,661,000
Common And Collective Funds [Member] | International [Member] | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 0 0
Common And Collective Funds [Member] | International [Member] | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets 54,088,000 54,661,000
Common And Collective Funds [Member] | International [Member] | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of pension plan assets $ 0 $ 0