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Consolidated Statements of Equity (Parenthetical) - shares
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Issuance of shares of nonvested stock (in shares)   61,244
Issuance of shares of RSUs (in shares) 18,234 3,138
Series A Preferred Stock    
Conversions of shares (in shares) 27,061,856