Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net income (loss) attributable to common shareholders	$ (18,057)	$ 10,002	$ (72,667)	$ 21,052
Dividends paid on unvested shares and units	0	(107)	(50)	(299)
Net income (loss) attributable to common shareholders	$ (18,057)	$ 9,895	$ (72,717)	$ 20,753
Denominator:
Weighted average number of common shares - basic (in shares)	46,965,526	46,913,922	46,958,143	46,744,890
Unvested shares (in shares)		238,244		212,074
Weighted average number of common shares - diluted (in shares)	46,965,526	47,152,166	46,958,143	46,956,964
Basic income (loss) per Common Share:
Net income (loss) attributable to common shareholders per weighted average basic common share (in dollars per share)	$ (0.38)	$ 0.21	$ (1.55)	$ 0.44
Diluted income (loss) per Common Share:
Net income (loss) attributable to common shareholders per weighted average diluted common share (in dollars per share)	$ (0.38)	$ 0.21	$ (1.55)	$ 0.44