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Commitments and Contingencies (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Jun. 30, 2017
Cash tender [Abstract]    
Minimum aggregate value of Operating Partnership units to be tendered $ 50.0  
Fair Value of Written Option, Cash Tender Agreement zero  
Share Price $ 65.43 $ 59.55
Approximate aggregate value of interests in the Operating Partnership that may be tendered $ 1,600.0  
Additional interest the Company would have owned in the Operating Partnership upon purchase of interests (in hundredths) 28.00%  
Continuing offer [Abstract]    
Common Stock, Conversion Basis one TRG Unit is exchangeable for one share of common stock  
Loss Contingencies [Line Items]    
Insurance Deductible $ 2.0  
Insurance Coverage Limit 900.0  
Insurance Recoveries - Expense Items 1.1  
Loss from Catastrophes 7.0  
Insurance Recoveries - Capital Items $ 0.9  
Series B Preferred Stock [Member]    
Continuing offer [Abstract]    
Convertible Preferred Stock, Terms of Conversion ratio of 14,000 shares of Series B Preferred Stock for one share of common stock