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Retirement Plans And Postretirement Benefits (Pension Plans With Projected Benefit Obligation In Excess Of Plan Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Predecessor [Member] | U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation   $ 142,126
Fair value of plan assets   93,897
Predecessor [Member] | Foreign [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation   18,271
Fair value of plan assets   $ 11,293
Successor [Member] | U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 140,230  
Fair value of plan assets 100,905  
Successor [Member] | Foreign [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 17,415  
Fair value of plan assets $ 11,142