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v3.3.1.900

Stockholders' Equity (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2008
Class of Stock [Line Items] |  |  |  |
Shares Issued, Price Per Share | $ 32.29 |  |  |
Proceeds from Issuance of Common Stock | $ 111,000,000 |  |  |
Common stock, shares authorized | 350,000,000 | 350,000,000 |  |
Preferred stock, shares authorized | 50,000,000 | 50,000,000 |  |
Stock Issued During Period, Shares, New Issues | 3,439,636 |  |  |
Common distributions declared per share | $ 1.11 | $ 1.0400 | $ 0.9400 |
Preferred stock, par or state value per share | $ 0 | 0 |  |
Stock issued during period, shares, Distribution Reinvestment and Stock Purchase Plan |  |  |  | 9,957,233
Shares reserved for issuance under the Stock Purchase Plan | 10,963,730 |  |  |
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares | 112,174 |  |  |
Equity Distribution Agreement [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, shares authorized | 20,000,000 |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 13,078,931 |  |  |
Series E Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, liquidation preference per share | $ 16.61 |  |  |
Number of common stock shares to which each preferred share is convertible after special dividend | 1.083 |  |  |
Declared preferred stock dividend | $ 1.33 | $ 1.33 | $ 1.33 |
Preferred stock, shares outstanding | 2,796,903 | 2,803,812 |  |
Series F Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized | 20,000,000 |  |  |
Preferred stock, shares outstanding | 16,452,496 | 2,464,183 |  |
Preferred stock, par or state value per share | $ 0.0001 |  |  |
Preferred stock, value, issued | $ 1,645 | $ 246 |  |
Restricted Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 551,293 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | 14,691 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period Net of Forfeitures | 551,293 |  |  |
Preferred Stock | Series E Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares | 0 | 0 | 0 |
Preferred Stock | Series F Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares | 0 | 0 | 0 |
Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Issued During Period, Shares, New Issues | 6,339,636 | 3,410,433 |  |
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares | 112,174 | 153,451 | 76,291 |
Common Stock | Series E Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Issued During Period, Shares, New Issues | 7,480 |  |  |
Common Stock | Sales [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares Issued, Price Per Share | $ 35.00 |  |  |
Proceeds from Issuance of Common Stock | $ 101,500,000 |  |  |
Common Stock | Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Issued During Period, Shares, New Issues | 2,900,000 |  |  |

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