Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Real estate, accumulated depreciation	$ 9,742	$ 8,768
Investments in real estate, net of accumulated depreciation	106,996	107,824
Intangible assets, accumulated amortization	5,876	5,703
Indebtedness, unamortized discounts, premiums and deferred financing costs	16,033	16,643
Indebtedness, net of unamortized discounts, premiums and deferred financing costs	$ 575,263	$ 625,916
Preferred shares, authorized	25,000,000	25,000,000
Common shares, par value	$ 1.50	$ 1.50
Common shares, shares authorized	200,000,000	200,000,000
Common shares, shares issued	1,849,530	1,850,451
Common shares, shares outstanding	1,849,530	1,850,451
Unvested restricted common share awards	4,997	6,844
VIE
Investment in mortgage loans	$ 409,041	$ 467,656
Investments in real estate, net of accumulated depreciation	25,264	18,020
Indebtedness, net of unamortized discounts, premiums and deferred financing costs	$ 390,675	$ 440,776
7.75% Series A Cumulative Redeemable Preferred Stock
Preferred shares, authorized	8,069,288	8,069,288
Preferred shares, dividend rate	7.75%	7.75%
Cumulative redeemable preferred shares, liquidation preference	$ 25.00	$ 25.00
Cumulative redeemable preferred shares, shares issued	5,727,500	5,727,500
Cumulative redeemable preferred shares, shares outstanding	5,727,500	5,727,500
Preferred shares, par value	$ 0.01	$ 0.01
8.375% Series B Cumulative Redeemable Preferred Stock
Preferred shares, authorized	4,300,000	4,300,000
Preferred shares, dividend rate	8.375%	8.375%
Cumulative redeemable preferred shares, liquidation preference	$ 25.00	$ 25.00
Cumulative redeemable preferred shares, shares issued	2,508,797	2,508,797
Cumulative redeemable preferred shares, shares outstanding	2,508,797	2,508,797
Preferred shares, par value	$ 0.01	$ 0.01
8.875% Series C Cumulative Redeemable Preferred Stock
Preferred shares, authorized	3,600,000	3,600,000
Preferred shares, dividend rate	8.875%	8.875%
Cumulative redeemable preferred shares, liquidation preference	$ 25.00	$ 25.00
Cumulative redeemable preferred shares, shares issued	1,758,030	1,758,030
Cumulative redeemable preferred shares, shares outstanding	1,758,030	1,758,030
Preferred shares, par value	$ 0.01	$ 0.01