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Equity (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 9 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 8 Months Ended | 9 Months Ended |  |  | 0 Months Ended | 1 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Nov. 07, 2014 | Sep. 30, 2014 Non-employees ACM Restricted common stock | Sep. 30, 2014 Non-employees ACM Selling and administrative expense Restricted common stock | Sep. 30, 2013 Non-employees ACM Selling and administrative expense Restricted common stock | Sep. 30, 2014 Non-employees ACM Selling and administrative expense Restricted common stock | Sep. 30, 2013 Non-employees ACM Selling and administrative expense Restricted common stock | Sep. 30, 2014 Employees Restricted common stock | Sep. 30, 2014 Employees Employee compensation and benefits Restricted common stock | Sep. 30, 2013 Employees Employee compensation and benefits Restricted common stock | Sep. 30, 2014 Employees Employee compensation and benefits Restricted common stock | Sep. 30, 2013 Employees Employee compensation and benefits Restricted common stock | May 31, 2014 Employees of the company and a related party ACM Restricted common stock | Sep. 30, 2014 Employees of the company and a related party ACM Restricted common stock May, 2015 | Sep. 30, 2014 Employees of the company and a related party ACM Restricted common stock May, 2016 | Jun. 30, 2014 Employees of the company and a related party ACM Employee compensation and benefits Restricted common stock | Jun. 30, 2014 Employees of the company and a related party ACM Selling and administrative expense Restricted common stock | Sep. 30, 2014 8.25% Series A cumulative redeemable preferred stock | Sep. 30, 2013 8.25% Series A cumulative redeemable preferred stock | Dec. 31, 2013 8.25% Series A cumulative redeemable preferred stock | Sep. 30, 2014 7.75% Series B cumulative redeemable preferred stock | Sep. 30, 2013 7.75% Series B cumulative redeemable preferred stock | Dec. 31, 2013 7.75% Series B cumulative redeemable preferred stock | Sep. 30, 2014 8.50% Series C preferred stock | Jul. 30, 2014 Preferred Stock 8.25% Series A cumulative redeemable preferred stock | Apr. 29, 2014 Preferred Stock 8.25% Series A cumulative redeemable preferred stock | Feb. 03, 2014 Preferred Stock 8.25% Series A cumulative redeemable preferred stock | Feb. 28, 2013 Preferred Stock 8.25% Series A cumulative redeemable preferred stock | Oct. 31, 2014 Preferred Stock 8.25% Series A cumulative redeemable preferred stock Subsequent event | Jul. 30, 2014 Preferred Stock 7.75% Series B cumulative redeemable preferred stock | Apr. 29, 2014 Preferred Stock 7.75% Series B cumulative redeemable preferred stock | Feb. 03, 2014 Preferred Stock 7.75% Series B cumulative redeemable preferred stock | May 31, 2013 Preferred Stock 7.75% Series B cumulative redeemable preferred stock | Oct. 31, 2014 Preferred Stock 7.75% Series B cumulative redeemable preferred stock Subsequent event | Jul. 30, 2014 Preferred Stock 8.50% Series C preferred stock | Apr. 29, 2014 Preferred Stock 8.50% Series C preferred stock | Feb. 28, 2014 Preferred Stock 8.50% Series C preferred stock | Sep. 30, 2014 Preferred Stock 8.50% Series C preferred stock | Oct. 31, 2014 Preferred Stock 8.50% Series C preferred stock Subsequent event | Jul. 30, 2014 Common Stock | Apr. 29, 2014 Common Stock | Feb. 12, 2014 Common Stock | Sep. 30, 2013 Common Stock | Mar. 31, 2013 Common Stock | Mar. 31, 2013 Common Stock | Sep. 30, 2014 Common Stock | Sep. 30, 2014 Common Stock | Feb. 28, 2014 Common Stock | Dec. 31, 2012 Common Stock | Nov. 05, 2014 Common Stock Subsequent event | May 31, 2014 Common Stock Non-management members of the Board of Directors | Sep. 30, 2013 Common Stock Non-management members of the Board of Directors Employee compensation and benefits | Jun. 30, 2014 Common Stock Non-management members of the Board of Directors Selling and administrative expense | Sep. 30, 2013 Common Stock Non-management members of the Board of Directors Selling and administrative expense
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of preferred stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400,000 |  |  |  |  | 1,200,000 |  |  |  | 900,000 | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.25% | 8.25% | 8.25% | 7.75% | 7.75% | 7.75% | 8.50% |  |  |  | 8.25% | 8.25% |  |  |  | 7.75% | 7.75% |  |  | 8.50% |  | 8.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  |  | $ 25.00 |  |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of preferred stock |  |  | $ 22,500,000 | $ 70,287,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,600,000 |  |  |  |  | $ 28,900,000 |  |  |  | $ 21,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option exercised by underwriters (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 151,500 |  |  |  |  | 60,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional net proceeds from exercise of option by underwriters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,700,000 |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 | 5,625,000 | 6,000,000 | 1,000,000 | 1,000,000 |  |  |  |  |  |  |
Value of common shares issued to the public (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.08 | $ 8.00 | $ 8.00 |  |  |  |  |  |  |  |  |
Proceeds from issuance of shares under public offering |  |  | 6,800,000 | 134,176,328 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,900,000 | 43,000,000 | 45,600,000 | 6,500,000 |  |  |  |  |  |  |  |
Number of shares which the entity may issue and sell through JMP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,500,000 | 6,000,000 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) | $ 0.13 | $ 0.13 | $ 0.39 | $ 0.37 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.13 | $ 0.13 | $ 0.13 |  |  |  |  |  |  |  | $ 0.13 |  |  |  |
Cash dividend declared on redeemable preferred stock (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.515625 | $ 0.515625 | $ 0.515625 |  | $ 0.515625 | $ 0.484375 | $ 0.484375 | $ 0.484375 |  | $ 0.484375 | $ 0.53125 | $ 0.5549 |  |  | $ 0.53125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  | 138,584 |  |  |  |  | 110,666 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total grant date fair value |  |  |  |  |  | 1,000,000 |  |  |  |  | 800,000 |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  | $ 200,000 | $ 100,000 | $ 300,000 | $ 200,000 |  | $ 100,000 | $ 100,000 | $ 300,000 | $ 200,000 |  |  |  | $ 300,000 | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 | $ 400,000 | $ 900,000
Number of fully vested shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 278,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 63,000 |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.00% | 33.00% | 33.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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