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Consolidated Statement of Equity (Parenthetical)
 6 Months Ended
Jun. 30, 2018
$ / shares
shares
Shares pursuant to dividend reinvestment plan (in shares) | shares 154,952
Shares due to exercise of employee stock options and issuance of directors' deferred stock (in shares) | shares 10,735
Issuance of partnership units pursuant to dividend reinvestment plan (in shares) | shares 257,139
Distributions payable common stock, per share (in usd per share) | $ / shares $ 1.04
Dividend Distributions Payable  
Distributions payable common stock, per share (in usd per share) | $ / shares 0.52
Distributions partnership units, per unit (in usd per share) | $ / shares $ 0.52
Series C Cumulative Preferred Stock  
Partial redemption of Series C Cumulative preferred stock (in shares) | shares 30,000
Series C Cumulative Preferred Stock | Dividend Distributions Payable  
Distributions payable on Series C preferred stock, per share (in usd per share) | $ / shares $ 42.97
Series D Cumulative Redeemable Preferred Stock  
Issuance of Series D Cumulative preferred stock (in shares) | shares 30,000
Series D Cumulative Redeemable Preferred Stock | Dividend Distributions Payable  
Distributions payable on Series C preferred stock, per share (in usd per share) | $ / shares $ 38.28