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Retirement Plans And Postretirement Benefits (Components Of Consolidated Net Pension Costs Retirement Plans) (Details) - USD ($)
$ in Thousands
 5 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2015
Aug. 14, 2015
Dec. 31, 2017
Dec. 31, 2016
U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 386   $ 1,305 $ 1,325
Interest cost 2,200   5,352 5,744
Expected return on plan assets (1,885)   (5,268) (4,940)
Mark-to-market loss (gain) 716   (4,140) (2,322)
Net cost 1,417   (2,751) (193)
U.S. | Predecessor [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost   $ 151    
Interest cost   854    
Net cost   1,005    
Foreign        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 281   710 698
Interest cost 94   199 243
Expected return on plan assets (59)   (299) (298)
Curtailment gain (675)      
Mark-to-market loss (gain) 1,843   (53) (220)
Net cost $ 1,484   $ 557 $ 423
Foreign | Predecessor [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost   98    
Interest cost   554    
Amortization of prior service cost   (12)    
Net cost   $ 640