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Consolidated Statement of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares
 6 Months Ended
Jun. 30, 2015
Issuance of stock, shares 171,453
Pursuant to dividend reinvestment plan, shares 97,896
Exercise of employee stock options and issuance of directors' deferred stock, shares 73,557
Issuance of partnership units, shares 46,060
Distributions payable common stock, per share (in usd per share) $ 0.86
Dividend Declared  
Distributions payable common stock, per share (in usd per share) 0.43
Distributions partnership units, per unit (in usd per unit) 0.43
Series C Preferred Stock | Dividend Declared  
Preferred stock, per share (in usd per share) $ 42.97