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Equity - Narrative (Details)
 1 Months Ended 12 Months Ended
Jan. 31, 2017
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Nov. 30, 2016
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Jul. 31, 2016
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May 31, 2016
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Dec. 31, 2017
USD ($)
$ / shares
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Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
$ / shares
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Dec. 31, 2017
$ / shares
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Dec. 31, 2016
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Jan. 20, 2016
USD ($)
Dec. 31, 2015
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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