Earnings Per Share (Information Related to EPS Calculation) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net income (loss)
Net income (loss)	$ 3,617	$ (34,103)	$ (64,542)	$ (159,185)
Net (income) loss attributable to noncontrolling interests	1,224	19	2,789	(33)
Net income (loss) attributable to common stockholders, diluted	4,841	(34,084)	(61,753)	(159,218)
Net income (loss) attributable to common stockholders, basic	$ 4,841	$ (34,084)	$ (61,753)	$ (159,218)
Shares
Weighted-average common shares outstanding - basic (in shares)	55,704	55,530	55,691	49,455
Restricted stock and stock options (in shares)	53	0	0	0
Weighted-average common shares outstanding - diluted (in shares)	55,757	55,530	55,691	49,455
Net income (loss) per common share
Basic income (loss) per share (in dollars per share)	$ 0.09	$ (0.61)	$ (1.11)	$ (3.22)
Diluted income (loss) per share (in dollars per share)	$ 0.09	$ (0.61)	$ (1.11)	$ (3.22)