Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings (Accumulated Deficit)	Treasury Stock	Noncontrolling Interest
Beginning balance (deficit) at Dec. 31, 2020	$ 181.4		$ 261.4	$ (4.4)	$ (3.3)	$ (70.6)	$ (1.7)
Beginning balance (deficit) (in shares) at Dec. 31, 2020		23,088,386
Net income	35.3				31.7		3.6
Foreign currency translation	(0.1)			(0.1)
Reclassification of de-designated interest rate collars	1.7			1.7
Issuance of stock grants	0.5		0.5
Issuance of stock grants (in shares)		13,420
Issuance of restricted stock units (in shares)		41,517
Issuance of performance stock units (in shares)		81,136
Non-cash stock-based compensation	5.6		5.6
Distributions to noncontrolling interests	(2.3)						(2.3)
Ending balance (deficit) at Dec. 31, 2021	222.1		267.5	(2.8)	28.4	(70.6)	(0.4)
Ending balance (deficit) (in shares) at Dec. 31, 2021		23,224,459
Net income	48.1				45.2		2.9
Foreign currency translation	0.5			0.5
Reclassification of de-designated interest rate collars	0.5			0.5
Issuance of stock grants	0.4		0.4
Issuance of stock grants (in shares)		14,635
Issuance of restricted stock units (in shares)		37,235
Non-cash stock-based compensation	8.6		8.6
Repurchases of common stock	(49.4)					(49.4)
Noncontrolling interests buyout	(2.3)		(2.3)
Distributions to noncontrolling interests	(2.8)						(2.8)
Ending balance (deficit) at Dec. 31, 2022	$ 225.7		274.2	(1.8)	73.6	(120.0)	(0.3)
Ending balance (deficit) (in shares) at Dec. 31, 2022	19,767,287	23,276,329
Net income	$ 34.7				31.1		3.6
Foreign currency translation	0.5			0.5
Issuance of stock grants	0.6		0.6
Issuance of stock grants (in shares)		18,660
Issuance of restricted stock units (in shares)		242,909
Issuance of performance stock units (in shares)		55,728
Payments of withholding taxes on share-based compensation	(5.8)		(5.8)
Non-cash stock-based compensation	9.8		9.8
Repurchases of common stock	(10.5)					(10.5)
Noncontrolling interests buyout	(0.9)		(0.9)
Distributions to noncontrolling interests	(3.4)						(3.4)
Ending balance (deficit) at Dec. 31, 2023	$ 250.7		$ 277.9	$ (1.3)	$ 104.7	$ (130.5)	$ (0.1)
Ending balance (deficit) (in shares) at Dec. 31, 2023	19,798,884	23,593,626