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Equity (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions |  |  | 3 Months Ended
--- | --- | --- | ---
Feb. 22, 2018 | Jan. 23, 2018 | Mar. 31, 2018 | Mar. 31, 2017
Class of Stock [Line Items] |  |  |  |
Income attributable to noncontrolling interests |  |  | $ 2,359 | $ 3,670
Series C Cumulative Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Depositary shares outstanding (in shares) |  |  | 4.2 |
Depository shares to cumulative redeemable preferred stock ratio |  |  | 1.00% |
Percentage of redeemable preferred stock |  |  | 6.875% |
Cumulative redeemable preferred stock liquidation preference (in usd per share) |  |  | $ 25.00 |
Depositary shares redeemed during period (in shares) | 3.0 |  |  |
Annual dividend on depositary shares (in usd per share) |  |  | $ 1.71875 |
Series D Cumulative Redeemable Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Depositary shares outstanding (in shares) |  | 3.0 |  |
Net proceeds from shares sold |  | $ 72,600 |  |
Depository shares to cumulative redeemable preferred stock ratio |  |  | 1.00% |
Percentage of redeemable preferred stock |  | 6.125% |  |
Cumulative redeemable preferred stock liquidation preference (in usd per share) |  | $ 25.00 |  |
Annual dividend on depositary shares (in usd per share) |  | $ 1.53125 |  |

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