Share-Based Compensation - Summary of Share-Based Compensation (income) expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Summary of share-based compensation expense
Share-based compensation expense (benefit)	$ 2,453	$ 857	$ 4,216	$ (1,288)
Share-based compensation expense before income tax	2,453	857	4,216	(1,288)
Income tax benefit	(28)	109	(55)
Share-based compensation (income) expense, net of income tax	2,425	966	4,161	(1,288)
Performance-based Restricted Stock Units ("PBRS")
Summary of share-based compensation expense
Share-based compensation expense (benefit)	466	(110)	606	(2,745)
Share-based compensation expense before income tax	466	(110)	606	(2,745)
Restricted Stock Awards And Restricted Stock Units
Summary of share-based compensation expense
Share-based compensation expense (benefit)	1,436	967	2,680	1,457
Share-based compensation expense before income tax	1,436	$ 967	2,680	$ 1,457
Stock Options
Summary of share-based compensation expense
Share-based compensation expense (benefit)	551		930
Share-based compensation expense before income tax	$ 551		$ 930