Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income (loss) attributable to common shareholders	$ (26,827)	$ 9,437	$ (54,610)	$ 11,050
Dividends paid on unvested shares and units	0	(107)	(50)	(192)
Net income attributable to common shareholders	$ (26,827)	$ 9,330	$ (54,660)	$ 10,858
Denominator:
Weighted average number of common shares - basic (in shares)	46,960,289	46,760,016	46,954,411	46,658,973
Unvested shares (in shares)		216,983		196,943
Weighted average number of common shares - diluted (in shares)	46,960,289	46,976,999	46,954,411	46,855,916
Basic income (loss) per Common Share:
Net income (loss) attributable to common shareholders per weighted average basic common share (in dollars per share)	$ (0.57)	$ 0.20	$ (1.16)	$ 0.23
Diluted income (loss) per Common Share:
Net income (loss) attributable to common shareholders per weighted average diluted common share (in dollars per share)	$ (0.57)	$ 0.20	$ (1.16)	$ 0.23