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Equity - Narrative (Details) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2017 shares | Nov. 30, 2016 shares | Jul. 31, 2016 shares | May 31, 2016 shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 $ / shares shares | Dec. 31, 2017 $ / shares shares | Dec. 31, 2016 shares | Jan. 20, 2016 USD ($) | Dec. 31, 2015 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Company-owned common units in the operating partnership |  |  |  |  |  |  |  |  | 155,602,508 | 136,492,235 |  |
Company’s ownership interest percentage |  |  |  |  |  |  |  |  | 99.60% | 93.50% |  | 61.30%
Non-controlling ownership interest percentage |  |  |  |  |  |  |  |  | 0.40% | 6.50% |  | 38.70%
Common Stock, Increase (Decrease) During Period [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Original issuance costs of redeemed Series B preferred stock | $ |  |  |  |  | $ 0 | $ 0 | $ (5,970,000) |  |  |  |  |
Stock repurchase program authorized | $ |  |  |  |  |  |  |  |  |  |  | $ 100,000,000.0 |
Common stock, dividends declared (in dollars per share) | $ / shares |  |  |  |  | $ 1 |  |  |  |  |  |  |
Restricted Performance-based Share Awards |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Increase (Decrease) During Period [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, conversion ratio |  |  |  |  | 1 |  |  |  |  |  |  |
Series A Cumulative Redeemable Preferred Units of the Operating Partnership |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Increase (Decrease) During Period [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of preferred stock |  |  |  |  | 6.25% |  |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  |  |  |  | 407,066 |  |  |
Liquidation preference of preferred stock (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 25.00 |  |  |
Preferred stock, dividends declared (in dollars per share) | $ / shares |  |  |  |  | $ 1.5625 |  |  |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Increase (Decrease) During Period [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of preferred stock |  |  |  |  |  |  |  | 8.375% |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  |  |  | 5,800,000 |  |  |  |
Liquidation preference of preferred stock (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 25 |  |  |  |
Par value of preferred stock (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.01 |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling common units in the operating partnership | 9,450,620 |  |  |  | 9,450,620 | 56,296,315 | 56,296,315 |  | 569,045 | 9,450,620 |  | 56,296,315
Common Stock, Increase (Decrease) During Period [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Beginning balance | 9,450,620 |  |  |  | 9,450,620 | 56,296,315 |  |  |  |  |  |
Partners' capital redeemed shares | (8,881,575) | (17,533,099) | (19,195,373) | (10,117,223) |  |  |  |  |  |  |  |
Noncontrolling common units in the operating partnership |  |  |  |  | 569,045 | 9,450,620 | 56,296,315 |  |  |  |  |
Partnership Interest |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Company-owned common units in the operating partnership |  |  |  |  |  |  |  |  | 155,602,508 | 136,492,235 |  | 89,153,780

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