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Distributions Paid and Payable (Tables)
9 Months Ended
Sep. 30, 2018
Dividends [Abstract]  
Summary of monthly distributions paid The following is a summary of monthly distributions paid per common share for the first nine months of 2018 and 2017:
Month
20182017
January $0.2125 $0.2025 
February 0.2190 0.2105 
March 0.2190 0.2105 
April 0.2195 0.2110 
May 0.2195 0.2110 
June 0.2195 0.2110 
July 0.2200 0.2115 
August 0.2200 0.2115 
September 0.2200 0.2115 
Total
$1.9690 $1.8910