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Consolidated Condensed Statements Of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Consolidated Condensed Statements Of Comprehensive Income (Loss) [Abstract]    
Interest rate swap, tax   $ 0
Investment in partnerships, tax $ 0  
Pension and postretirement obligations, tax 0 0
Foreign currency translation adjustment, tax $ 0 $ 0