Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Cumulative redeemable preferred stock, shares issued (in shares)	72,000	72,000
Cumulative redeemable preferred stock, shares outstanding (in shares)	72,000	72,000
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, shares issued (in shares)	22,123,128	21,704,359
Common stock, shares outstanding (in shares)	22,123,128	21,704,359