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Equity (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 29, 2015 | Apr. 29, 2015 | Feb. 11, 2015 | Feb. 02, 2015 | May. 31, 2015 | Mar. 31, 2015 | Feb. 28, 2014 | Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Jul. 31, 2015
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,500,000 |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of shares under public offering |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,800,000 |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) |  |  |  |  |  |  |  | $ 0.15 |  | $ 0.13 |  | $ 0.28 | $ 0.26 |  |
Preferred distributions declared and paid |  |  |  |  |  |  |  |  |  |  |  | $ 3,776,860 |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of common stock remaining under shelf registration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 330,400,000
Aggregate amount of securities for which the entity filed shelf registration statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total grant date fair value |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
Forfeited (in shares) |  |  |  |  |  |  |  | 916 |  |  |  |  |  |  |
Mr. Ivan Kaufman. | Restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of fully vested shares issued |  |  |  |  |  |  |  |  | 74,294 |  |  |  |  |  |
Total grant date fair value |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |
Mr. Ivan Kaufman. | Restricted common stock | First Anniversary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |
Mr. Ivan Kaufman. | Restricted common stock | Second Anniversary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |
Mr. Ivan Kaufman. | Restricted common stock | Third Anniversary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |
Mr. Ivan Kaufman. | Performance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  | 445,765 |  |  |  |  |  |
Total grant date fair value |  |  |  |  |  |  |  |  | $ 1,200,000 |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |
Mr. Ivan Kaufman. | Employee compensation and benefits | Restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |
Mr. Ivan Kaufman. | Employee compensation and benefits | Performance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |
Employees of the company and a related party | Restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of fully vested shares issued |  |  |  |  |  | 328,400 |  |  |  |  |  |  |  |  |
Total grant date fair value |  |  |  |  |  | $ 2,300,000 |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 33.00% |  |  |  |  |  |  |  |  |
Employees of the company and a related party | Restricted common stock | First Anniversary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  |
Employees of the company and a related party | Restricted common stock | Second Anniversary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  |
Employees of the company and a related party | Employee compensation and benefits | Restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |
Employees of the company and a related party | Selling and administrative expense | Restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |
Employees of the company and a related party | Mr. Ivan Kaufman. | Restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of fully vested shares issued |  |  |  |  |  | 105,000 |  |  |  |  |  |  |  |  |
Non-employees | Selling and administrative expense | Restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  | $ 200,000 |  | $ 100,000 |  | $ 400,000 | $ 200,000 |  |
Non-employees | ACM | Restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  | 154,169 |  |  |
Total grant date fair value |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000 |  |  |
Employees | Restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  | 213,157 |  |  |
Total grant date fair value |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  |  |
Employees | Employee compensation and benefits | Restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  | $ 300,000 |  |  |  | 400,000 | $ 100,000 |  |
Employees | Mr. Ivan Kaufman. | Performance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  |  |
Non-management members of the Board of Directors | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of fully vested shares issued |  |  |  |  | 20,430 |  |  |  |  |  |  |  |  |  |
Non-management members of the Board of Directors | Selling and administrative expense | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |
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% |
Preferred Stock | 8.25% Series A preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared on redeemable preferred stock (in dollars per share) |  | $ 0.515625 |  | $ 0.515625 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock | 8.25% Series A preferred stock | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent) | 8.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared on redeemable preferred stock (in dollars per share) | $ 0.515625 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock | 7.75% Series B preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared on redeemable preferred stock (in dollars per share) |  | 0.48375 |  | 0.48375 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock | 7.75% Series B preferred stock | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent) | 7.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared on redeemable preferred stock (in dollars per share) | $ 0.484375 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock | 8.50% Series C preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of preferred stock (in shares) |  |  |  |  |  |  | 900,000 |  |  |  |  |  |  |  |
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent) |  |  |  |  |  |  | 8.50% |  |  |  |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  |  |  |  |  |  | $ 25.00 |  |  |  |  |  |  |  |
Net proceeds from issuance of preferred stock |  |  |  |  |  |  | $ 21,600,000 |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared on redeemable preferred stock (in dollars per share) |  | $ 0.53125 |  | $ 0.53125 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock | 8.50% Series C preferred stock | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent) | 8.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared on redeemable preferred stock (in dollars per share) | $ 0.53125 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |
Proceeds from issuance of shares under public offering |  |  |  |  |  |  |  |  |  |  | $ 6,500,000 |  |  |  |
Number of shares which the entity may issue and sell through JMP |  |  |  |  |  |  | 7,500,000 |  |  |  |  |  |  |  |
Number of shares available for sale through JMP |  |  |  |  |  |  |  | 6,500,000 |  |  |  | 6,500,000 |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) |  |  | $ 0.13 |  |  |  |  |  |  |  |  |  |  |  |
Common Stock | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) | $ 0.15 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock | Non-management members of the Board of Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of fully vested shares issued |  |  |  |  |  | 63,000 |  |  |  |  |  |  |  |  |
Common Stock | Non-management members of the Board of Directors | Selling and administrative expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |

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