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Consolidated Statement of Stockholders' Equity (Parenthetical)	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Shares pursuant to dividend reinvestment plan (in shares) | shares	46,286
Due to exercise of employee stock options and issuance of directors' deferred stock (in shares) | shares	16,616
Issuance of partnership units pursuant to dividend reinvestment plan (in shares) | shares	39,111
Distributions payable common stock, per share (in usd per share)	$ 0.51
Dividend Distributions Payable
Distributions payable common stock, per share (in usd per share)	0.51
Distributions partnership units, per unit (in usd per share)	0.51
Dividend Distributions Payable | Series C Preferred Stock
Distributions payable on Series C preferred stock, per share (in usd per share)	$ 42.97

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