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Equity - Repurchases of Common Stock Under Stock Repurchase Programs (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Equity [Abstract]              
Shares 0 0 376 7,652 701 595 4,969
Amount $ 0 $ 0 $ 11,953 $ 233,633 $ 23,751 $ 19,993 $ 173,913