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Common Share Capitalization (Tables)
 6 Months Ended
Jun. 30, 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 three and six month periods ended June 30, 2017 and 2016:
 
 
Three Month Period Ended June 30, 2017
 
Three Month Period Ended June 30, 2016
 
Six Month
Period Ended June 30, 2017
 
Six Month
Period Ended June 30, 2016
Common Shares Outstanding
(3/31/2017, 3/31/2016, 12/31/2016, and 12/31/2015, respectively)
 
32,164,215

 
32,962,979

 
32,294,703

 
33,126,012

Share Activity:
 
 
 
 
 
 
 
 
Shares repurchased
 
(51,518
)
 
(219,623
)
 
(182,006
)
 
(382,656
)
Common Shares Outstanding
(6/30/2017, 6/30/2016, 6/30/2017, and 6/30/2016, respectively)
 
32,112,697

 
32,743,356

 
32,112,697

 
32,743,356