Earnings Per Share - Computation Of Basic And Diluted EPS (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic:
Net income attributable to common shareholders	$ 4,163	$ 24,499	$ 5,450	$ (11,938)	$ 8,052	$ 31,695	$ 16,854	$ 1,318	$ 22,174	$ 57,919	$ 28,598
Less: Undistributed earnings allocated to participating securities									(140)	(487)	(273)
Accretion of redeemable noncontrolling interests									(2,400)	(143)	0
Net income available to common shareholders, basic									$ 19,634	$ 57,289	$ 28,325
Weighted average number of shares outstanding, basic (in shares)									148,993	147,536	146,702
Effect of dilutive securities:
Share-based awards other than participating securities									$ 0	$ 0	$ 0
Share-based awards other than participating securities (in shares)									904	2,041	128
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted									$ 1	$ 6	$ 1
Net income available to common shareholders, diluted									$ 19,635	$ 57,295	$ 28,326
Weighted average number of shares outstanding, diluted (in shares)									149,897	149,577	146,830