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Divestiture Related Activities Divestitiure Related Activities Level 4 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
(Losses) gains on divestitures $ 29,053 $ 7,829 $ 13,363
Impairment losses (22,038) (34,648) (6,841)
Gains (losses) on divestitures and impairment charges, net 7,015 (26,819) 6,522
Income from discontinued operations, net $ 0 $ 0 $ (390)