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, 2018	$ 368.6		$ 257.7	$ (2.4)	$ 120.7	$ (7.5)	$ 0.1
Beginning balance (deficit) (in shares) at Dec. 31, 2018		22,783,976
Net income (loss)	51.7				48.8		2.9
Foreign currency translation	0.1			0.1
Change in fair value of interest rate collars	(0.4)			(0.4)
Issuance of stock grants	0.8		0.8
Issuance of stock grants (in shares)		14,076
Issuance of restricted stock units	0.0
Issuance of restricted stock units (in shares)		90,214
Issuance of performance stock units	0.0
Issuance of performance stock units (in shares)		62,094
Non-cash stock-based compensation	4.1		4.1
Repurchases of common stock	(47.8)					(47.8)
Distributions to noncontrolling interest	(3.2)						(3.2)
Ending balance (deficit) at Dec. 31, 2019	373.9		262.6	(2.7)	169.5	(55.3)	(0.2)
Ending balance (deficit) (in shares) at Dec. 31, 2019		22,950,360
Net income (loss)	(172.9)				(172.8)		(0.1)
Foreign currency translation	0.1			0.1
Reclassification of de-designated interest rate collars	1.1			1.1
Change in fair value of interest rate collars	(2.9)			(2.9)
Issuance of stock grants	0.5		0.5
Issuance of stock grants (in shares)		25,066
Issuance of restricted stock units	0.0
Issuance of restricted stock units (in shares)		66,259
Issuance of performance stock units	0.0
Issuance of performance stock units (in shares)		46,701
Noncontrolling interest buyout	(1.7)		(1.7)
Repurchases of common stock	(15.3)					(15.3)
Distributions to noncontrolling interest	(1.4)						(1.4)
Ending balance (deficit) at Dec. 31, 2020	$ 181.4		261.4	(4.4)	(3.3)	(70.6)	(1.7)
Ending balance (deficit) (in shares) at Dec. 31, 2020	23,088,386	23,088,386
Net income (loss)	$ 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	0.0
Issuance of restricted stock units (in shares)		41,517
Issuance of performance stock units	0.0
Issuance of performance stock units (in shares)		81,136
Non-cash stock-based compensation	5.6		5.6
Distributions to noncontrolling interest	(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	23,224,459