Redeemable Noncontrolling Interests / Redeemable Partnership Units (Narrative) (Details) - USD ($) $ in Thousands |
Dec. 31, 2019 |
Dec. 31, 2018 |
---|---|---|
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract] | ||
Fair value of Series G convertible preferred units and Series D-13 cumulative redeemable preferred units | $ 50,561 | $ 50,561 |