Earnings Per Common Share - Computations of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Loss from continuing operations		$ (22,330)	$ (7,043)	$ (46,344)	$ (24,714)
Allocation of earnings to unvested restricted share awards		121	(151)	(349)	(453)
Adjusted net loss from continuing operations		(22,209)	(7,194)	(46,693)	(25,167)
Income from discontinued operations		53,649	6,087	69,524	20,071
Allocation of earnings to unvested restricted share awards to discontinued operations		(283)	0	0	0
Adjusted income from discontinuing operations		53,366	6,087	69,524	20,071
Adjusted net income (loss), basic		31,157	(1,107)	22,831	(5,096)
Adjusted net income (loss), diluted		$ 31,157	$ (1,107)	$ 22,831	$ (5,096)
Denominator:
Weighted average shares outstanding - basic (in shares)		84,496	82,186	84,457	82,142
Earnings per common share, basic:
Continuing operations, basic (in dollars per share)		$ (0.26)	$ (0.09)	$ (0.55)	$ (0.31)
Discontinued operations, basic (in dollars per share)		0.63	0.07	0.82	0.24
Basic net income (loss) per common share (in dollars per share)	[1]	0.37	(0.01)	0.27	(0.06)
Earnings per common share, diluted:
Continuing operations, diluted (in dollars per share)		(0.26)	(0.09)	(0.55)	(0.31)
Discontinued operations, diluted (in dollars per share)		0.63	0.07	0.82	0.24
Diluted net income (loss) per common share (in dollars per share)	[1]	0.37	(0.01)	0.27	(0.06)
Dividends declared per common share (in dollars per share)		$ 0.17	$ 0.30	$ 0.77	$ 0.90

[1] Earnings per share may not sum due to rounding