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Consolidated Statement of Stockholders' Equity (Parenthetical)
 9 Months Ended
Sep. 30, 2016
$ / shares
shares
Shares pursuant to dividend reinvestment plan (in shares) | shares 142,621
Due to exercise of employee stock options and issuance of directors' deferred stock (in shares) | shares 224,011
Issuance of partnership units pursuant to dividend reinvestment plan (in shares) | shares 93,867
Distributions payable common stock, per share (in usd per share) $ 1.41
Dividend Distributions Payable  
Distributions payable common stock, per share (in usd per share) 0.47
Distributions partnership units, per unit (in usd per share) 0.47
Dividend Distributions Payable | Series C Preferred Stock  
Distributions payable on Series C preferred stock, per share (in usd per share) $ 42.97