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Dispositions, Assets Held for Sale and Discontinued Operations - Condensed Cash Flows (Details) - Discontinued Operations - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Net Cash Provided by (Used in) Discontinued Operations [Abstract]    
Operating Activities $ 0 $ (2,095)
Investing Activities 0 (592)
Financing Activities 0 (123)
Net cash flows provided by discontinued operations $ 0 $ (2,810)