Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income	$ 54,490	$ 14,507	$ 12,930	$ 11,114	$ 18,330	$ 13,850	$ 68,997	$ 32,180
Less income allocated to non-controlling interests	(107)				(91)		(202)	(179)
Less income allocated to participating securities:
Non-forfeitable dividends on participating securities	(133)				(113)		(270)	(233)
Income allocated to participating securities	(185)						(137)
Total net income allocated to participating securities	(318)				(113)		(407)	(233)
Net income available to common stockholders	54,065				18,126		68,388	31,768
Net income for diluted net income per share	$ 54,065				$ 18,126		$ 68,388	$ 31,768
Reconciliation of shares
Shares for basic net income per share	39,492				39,169		39,347	39,135
Effect of dilutive securities:
Total effect of dilutive securities (in shares)	173				1		173	1
Shares for diluted net income per share	39,665				39,170		39,520	39,136
Basic net income per share (in dollars per share)	$ 1.37				$ 0.46		$ 1.74	$ 0.81
Diluted net income per share (in dollars per share)	$ 1.36				$ 0.46		$ 1.73	$ 0.81
Stock options
Effect of dilutive securities:
Stock options and performance-based stock units (in shares)					1			1
Performance-based stock units
Effect of dilutive securities:
Stock options and performance-based stock units (in shares)	173						173