XML 92 R82.htm IDEA: XBRL DOCUMENT v3.8.0.1
Dividends (Details) - Series A Preferred Shares - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Dividends Payable [Line Items]    
Shares redeemed by the issuer 2,567  
Number of shares outstanding 0 0