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Held for Sale and Discontinued Operations - Reconciliation of Cash Flows (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]      
Net cash provided by operating activities from discontinued operations $ 351,557 $ 287,049 $ 365,138
Net cash used in investing activities from discontinued operations $ (232,329) $ (430,917) $ (121,893)