Retirement Plans And Postretirement Benefits (Pension Plans With An Accumulated 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, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets
Accumulated benefit obligation		$ 142,126
Fair value of plan assets		93,897
Predecessor [Member] | Foreign [Member]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets
Accumulated benefit obligation		16,749
Fair value of plan assets		$ 11,293
Successor [Member] | U.S. [Member]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets
Accumulated benefit obligation	$ 140,230
Fair value of plan assets	100,905
Successor [Member] | Foreign [Member]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets
Accumulated benefit obligation	16,057
Fair value of plan assets	$ 11,142