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Common Share Capitalization (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Summary of Common Shares Outstanding
The following table summarizes issuance, repurchase, and other activity with respect to the Company's common shares for the years ended December 31, 2017, 2016, and 2015:
 
 
Year Ended December 31, 2017
 
Year Ended December 31, 2016
 
Year Ended December 31, 2015
Common Shares Outstanding
(12/31/2016, 12/31/2015, and 12/31/2014, respectively)
 
32,294,703

 
33,126,012

 
33,449,678

Share Activity:
 
 
 
 
 
 
Shares repurchased
 
(961,566
)
 
(833,784
)
 
(325,613
)
Director LTIP Units exercised
 
2,801

 
2,475

 
1,947

Common Shares Outstanding
(12/31/2017, 12/31/2016, and 12/31/2015, respectively)
 
31,335,938

 
32,294,703

 
33,126,012