Earnings Per Share (Information Related to EPS Calculation) (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
Net income (loss)
Net income (loss)	$ 2,117	$ 164,002	$ (62,425)	$ 4,817
Net (income) loss attributable to noncontrolling interests	1,936	(24,292)	4,725	(24,325)
Net income (loss) attributable to common stockholders, basic	4,053	139,710	(57,700)	(19,508)
Net income (loss) attributable to common stockholders, diluted	$ 4,053	$ 139,710	$ (57,700)	$ (19,508)
Shares
Weighted-average common shares outstanding - basic (in shares)	55,727	55,542	55,703	51,493
Restricted stock and stock options (in shares)	29	43	0	0
Weighted-average common shares outstanding - diluted (in shares)	55,756	55,585	55,703	51,493
Net income (loss) per common share
Basic income (loss) per share (in dollars per share)	$ 0.07	$ 2.52	$ (1.04)	$ (0.38)
Diluted income (loss) per share (in dollars per share)	$ 0.07	$ 2.51	$ (1.04)	$ (0.38)