Earnings Per Share - Computation Of Basic And Diluted EPS (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic:
Net income attributable to common shareholders	$ 8,052	$ 31,695	$ 16,854	$ 1,318	$ (13,747)	$ 27,121	$ 17,784	$ (2,560)	$ 57,919	$ 28,598	$ 30,052
Less: Undistributed earnings allocated to participating securities									(487)	(273)	(356)
Accretion of redeemable noncontrolling interests									(143)	0	0
Net income available to common shareholders, basic									$ 57,289	$ 28,325	$ 29,696
Weighted average number of shares outstanding, basic (in shares)									147,536	146,702	145,295
Effect of dilutive securities:
Net income available to common shareholders, basic									$ 57,289	$ 28,325	$ 29,696
Share-based awards other than participating securities									$ 0	$ 0	$ 0
Share-based awards other than participating securities (in shares)									2,041	128	5
Undistributed earnings reallocated to participating securities									$ 6	$ 1	$ 0
Net income available to common shareholders, diluted									$ 57,295	$ 28,326	$ 29,696
Weighted average number of shares outstanding, diluted (in shares)									149,577	146,830	145,300