Shareholders' Equity and Earnings (Loss) Per Common Share - Basic and Diluted Earnings (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Shareholders' Equity and Earnings Per Common Share
Net income (loss)	$ (24,069)	$ 48,175
Net (income) loss attributable to redeemable noncontrolling interests	2,230	(5,250)
Net loss attributable to noncontrolling interests	1,108
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ (20,731)	$ 42,925
Weighted average number of common shares outstanding - basic	131,540	134,542
Effect of dilutive securities		887
Weighted average number of common shares outstanding - diluted	131,540	135,429
Earnings (loss) per common share - basic and diluted	$ (0.16)	$ 0.32