Earnings Per Share - Computations Of Basic And Diluted EPS (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic:
Net income (loss) attributable to common shareholders	$ (19,043)	$ 24,499	$ (35,630)	$ 18,011
Less: Undistributed earnings allocated to participating securities		(180)		(117)
Less: Accretion of redeemable noncontrolling interests		(128)	(241)	(2,283)
Net income (loss) available to common shareholders, basic	$ (19,043)	$ 24,191	$ (35,871)	$ 15,611
Weighted average number of shares outstanding, basic (in shares)	150,088	149,032	150,018	148,956
Diluted:
Net income (loss) available to common shareholders, basic	$ (19,043)	$ 24,191	$ (35,871)	$ 15,611
Weighted average number of shares outstanding, basic (in shares)	150,088	149,032	150,018	148,956
Effect of dilutive securities:
Share-based awards other than participating securities (in shares)		919		868
Undistributed earnings reallocated to participating securities		$ 2		$ 1
Net income (loss) available to common shareholders, diluted	$ (19,043)	$ 24,193	$ (35,871)	$ 15,612
Weighted average number of shares outstanding, diluted (in shares)	150,088	149,951	150,018	149,824