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Basis of Presentation (Additional Cash Flow Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Non-cash operating items:        
Equity in net (income) loss of affiliates $ (43,372) $ (6,948) $ (183,086) $ (96,799)
Deferred taxes     26,655 29,010
Depreciation and amortization     33 45
Amortization of prior service credit and actuarial (gain) loss     770 687
Net non-cash operating items - continuing operations     (155,628) (67,057)
Continuing Operations [Member]        
Supplemental information:        
Interest paid     22 15
Tax payments (refunds)     10,038 194
Discontinued Operations [Member]        
Supplemental information:        
Interest paid     $ 55 $ 641