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Equity (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 29, 2020 $ / shares | May 06, 2020 $ / shares | May 01, 2020 $ / shares | Feb. 13, 2020 $ / shares | Jan. 31, 2020 $ / shares | Jun. 30, 2020 USD ($) Vote $ / shares shares | Mar. 31, 2020 shares | Feb. 29, 2020 shares | Jun. 30, 2020 USD ($) Vote $ / shares shares | Mar. 31, 2020 USD ($) shares | Jun. 30, 2019 USD ($) $ / shares shares | Mar. 31, 2019 | Jun. 30, 2020 USD ($) Vote $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Dec. 31, 2019 $ / shares | Aug. 31, 2019 shares | Dec. 31, 2018 | Jul. 20, 2018 | Jul. 03, 2018 | Jun. 30, 2018 USD ($)
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of shares under public offering | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,008 | $ 115,736 |  |  |  |  |  |
Number of shares purchased |  |  |  |  |  |  |  | 747,500 |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock | $ |  |  |  |  |  |  |  |  | $ 1,470 |  | $ 11,574 |  | $ 12,761 | 11,574 |  |  |  |  |  |
Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.01 |  |  | $ 0.01 |  |  |  | $ 0.01 |  | $ 0.01 |  |  |  |  |
OP Units redeemed by cash | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600 | $ 1,673 |  |  |  |  |  |
Number of shares purchased |  |  |  |  |  |  |  | 747,500 |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.30 |  | $ 0.28 |  | $ 0.60 | $ 0.55 |  |  |  |  |  |
Employee compensation and benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  |  |  |  |  |  |  | $ 149,595,000 |  |  |  |  |  |  |  |  |  |
Restricted common stock | Certain employees of ours |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of fully vested shares issued |  |  |  |  |  |  |  |  |  | 298,991 |  |  |  |  |  |  |  |  |  |
Total grant date fair value | $ |  |  |  |  |  |  |  |  |  | $ 3,200 |  |  |  |  |  |  |  |  |  |
Restricted common stock | Chief executive officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of fully vested shares issued |  |  |  |  |  |  |  |  |  | 45,928 |  |  |  |  |  |  |  |  |  |
Total grant date fair value | $ |  |  |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |
Restricted common stock | Chief executive officer | First Anniversaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |
Restricted common stock | Chief executive officer | Second Anniversaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |
Restricted common stock | Chief executive officer | Third Anniversaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |
Restricted common stock | Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  | 33.00% |  |  |  |  |  |  |  |  |  |
Restricted common stock | Employees | March 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  | 33.00% |  |  |  |  |  |  |  |  |  |
Performance-based restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock with fully vested of date (in shares) |  |  |  |  |  |  |  |  |  | 421,348 |  |  |  |  |  |  |  |  |  |
Restricted stock with fully vested net settled of date (in shares) |  |  |  |  |  |  |  |  |  | 215,014 |  |  |  |  |  |  |  |  |  |
Performance-based restricted stock | Chief executive officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted of restricted stock units that vest at the end of four-year performance period (in shares) |  |  |  |  |  |  |  |  |  | 275,569 |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  |  |  |  |  | 4 years |  | 4 years |  |  |  |  |  |  |  |
Total grant date fair value | $ |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |  |
8.25% Series A preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 8.25% | 8.25% | 8.25% |  |  |  |  |
7.75% Series B preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 7.75% | 7.75% | 7.75% |  |  |  |  |
8.50% Series C preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 8.50% | 8.50% | 8.50% |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock sold (in shares) |  |  |  |  |  |  |  |  | 1,958,008 |  | 9,200,000 |  | 3,308,008 | 9,200,000 |  |  |  |  |  |
Value of common stock available under shelf registration statement | $ |  |  |  |  |  | $ 99,400 |  |  | $ 99,400 |  |  |  | $ 99,400 |  |  |  |  |  |  |
Aggregate amount of debt securities, common stock, preferred stock, depositary shares and warrants filed under shelf registration statement | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000
Number of shares purchased |  |  |  |  |  |  |  |  | 376,000 |  | 920,000 |  | 1,625,777 | 920,000 |  |  |  |  |  |
Repurchase of common stock | $ |  |  |  |  |  |  |  |  | $ 3 |  | $ 9 |  | $ 16 | $ 9 |  |  |  |  |  |
Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares purchased |  |  |  |  |  |  |  |  | 376,000 |  | 920,000 |  | 1,625,777 | 920,000 |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) | $ / shares | $ 0.31 | $ 0.30 |  | $ 0.30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock | Board of Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock sold (in shares) |  |  |  |  |  |  | 100,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock | Non-management members of the Board of Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of fully vested shares issued |  |  |  |  |  |  |  |  |  | 36,396 |  |  |  |  |  |  |  |  |  |
Total grant date fair value | $ |  |  |  |  |  |  |  |  |  | $ 400 |  |  |  |  |  |  |  |  |  |
Preferred Stock | 8.25% Series A preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared on redeemable preferred stock (in dollars per share) | $ / shares | $ 0.515625 |  | $ 0.515625 |  | $ 0.515625 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent) | 8.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock | 7.75% Series B preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared on redeemable preferred stock (in dollars per share) | $ / shares | $ 0.484375 |  | 0.484375 |  | 0.484375 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent) | 7.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock | 8.50% Series C preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared on redeemable preferred stock (in dollars per share) | $ / shares | $ 0.53125 |  | $ 0.53125 |  | $ 0.53125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent) | 8.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Partnership Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion ratio for operating partnership units to common stock shares |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Operating Partnership Units | Special voting preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred stock shares paired with each OP units |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.01 |  |  | $ 0.01 |  |  |  | $ 0.01 |  |  |  |  |  |  |
Number of vote per share of Special Voting Preferred Shares | Vote |  |  |  |  |  | 1 |  |  | 1 |  |  |  | 1 |  |  |  |  |  |  |
OP units outstanding (in shares) |  |  |  |  |  | 20,369,265 |  |  | 20,369,265 |  |  |  | 20,369,265 |  |  |  |  |  |  |
Voting power of outstanding stock (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 15.40% |  |  |  |  |  |  |
5.25% Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with exchange of convertible debt notes (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 363,013 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 5.25% |  |  | 5.25% |  |  |  | 5.25% |  | 5.25% |  | 5.25% | 5.25% | 5.25% |
5.375% Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with exchange of convertible debt notes (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 41,601 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 5.375% |  |  | 5.375% |  |  |  | 5.375% |  |  |  | 5.375% |  |  |
6.50% Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.50% |  |  |
Share repurchase | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares purchased |  |  |  |  |  | 993,106 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock | $ |  |  |  |  |  | $ 3,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares purchased |  |  |  |  |  | 993,106 |  |  |  |  |  |  |  |  |  |  |  |  |  |
At-The-Market | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available under an "At-The-Market" equity offering with JMP Securities LLC |  |  |  |  |  | 1,000,000 |  |  | 1,000,000 |  |  |  | 1,000,000 |  |  | 7,500,000 |  |  |  |
Issued price per share (in dollars per share) | $ / shares |  |  |  |  |  | $ 3.98 |  |  | $ 3.98 |  |  |  | $ 3.98 |  |  |  |  |  |  |
Number of common stock sold (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 3,308,008 |  |  |  |  |  |  |
Proceeds from issuance of shares under public offering | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,000 |  |  |  |  |  |  |

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