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Basis of Presentation (Additional Cash Flow Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Non-cash operating items:        
Equity in net (income) loss of affiliates $ (55,095) $ (43,372) $ (56,734) $ (183,086)
Deferred taxes     (1,237) 26,655
Depreciation and amortization     16 33
Amortization of prior service credit and actuarial (gain) loss     797 770
Net non-cash operating items - continuing operations     (57,158) (155,628)
Continuing Operations [Member]        
Supplemental information:        
Interest paid     17 22
Tax payments (refunds)     $ (55) 10,038
Discontinued Operations [Member]        
Supplemental information:        
Interest paid       $ 55