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Basis of Presentation (Additional Cash Flow Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Non-cash operating items:      
Equity in net (income) loss of affiliates $ 3,455 $ (1,639) $ (139,714)
Deferred taxes   (7,043) 11,695
Depreciation and amortization   11 32
Amortization of prior service credit and actuarial (gain) loss   532 513
Net non-cash operating items - continuing operations   (8,139) (127,474)
Continuing Operations [Member]      
Supplemental information:      
Interest paid   11 11
Tax payments (refunds)   $ (117) 9,541
Discontinued Operations [Member]      
Supplemental information:      
Interest paid     $ 55