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Equity - Dividends (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Equity [Abstract]          
Operating loss carryforwards         $ 567,700
Common stock dividends declared $ 6,291 $ 6,165 $ 18,991 $ 6,165  
Common stock dividends declared per share (in dollars per share) $ 0.10 $ 0.09 $ 0.29 $ 0.09