Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic Income (Loss) Per Share
Undistributed net income (loss) from operations	$ 27,448	$ (15,803)	$ (360)	$ (59,470)
Basic net income (loss) attributable to common shares	$ 27,448	$ (15,803)	$ (360)	$ (59,470)
Basic weighted average shares outstanding (in shares)	20,508,135	20,339,895	20,467,969	20,299,461
Basic undistributed net income (loss) per share attributable to common shares (in dollars per share)	$ 1.34	$ (0.78)	$ (0.02)	$ (2.93)
Diluted Income (Loss) Per Share
Undistributed net income (loss) from operations	$ 27,448	$ (15,803)	$ (360)	$ (59,470)
Diluted net income (loss) attributable to common shares	$ 27,448	$ (15,803)	$ (360)	$ (59,470)
Basic weighted average shares outstanding (in shares)	20,508,135	20,339,895	20,467,969	20,299,461
Effect of dilutive options and restricted share units (in shares)	209,000	0
Diluted weighted average shares outstanding (in shares)	20,717,018	20,339,895	20,467,969	20,299,461
Diluted undistributed net income (loss) per share attributable to common shares (in dollars per share)	$ 1.32	$ (0.78)	$ (0.02)	$ (2.93)