Condensed 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 (in shares) at Dec. 31, 2018		22,783,976
Beginning Balance at Dec. 31, 2018	$ 368.6	$ 0.0	$ 257.7	$ (2.4)	$ 120.7	$ (7.5)	$ 0.1
Increase (Decrease) in Stockholders' Equity
Net (loss) income	10.9				10.6		0.3
Foreign currency translation	0.2			0.2
Issuance of restricted stock units (in shares)		7,518
Issuance of restricted stock units	0.0
Issuance of performance stock units (in shares)		62,094
Issuance of performance stock units	0.0
Non-cash stock-based compensation	0.4		0.4
Treasury stock	(2.3)					(2.3)
Distributions to noncontrolling interest	(0.7)						(0.7)
Ending Balance (in shares) at Mar. 31, 2019		22,853,588
Ending Balance at Mar. 31, 2019	377.0		258.0	(2.2)	131.3	(9.8)	(0.3)
Beginning balance (in shares) at Dec. 31, 2018		22,783,976
Beginning Balance at Dec. 31, 2018	368.6	$ 0.0	257.7	(2.4)	120.7	(7.5)	0.1
Increase (Decrease) in Stockholders' Equity
Net (loss) income	42.2
Treasury stock	(32.3)
Ending Balance (in shares) at Sep. 30, 2019		22,948,766
Ending Balance at Sep. 30, 2019	378.3		260.8	(3.3)	160.6	(39.8)
Beginning balance (in shares) at Mar. 31, 2019		22,853,588
Beginning Balance at Mar. 31, 2019	377.0		258.0	(2.2)	131.3	(9.8)	(0.3)
Increase (Decrease) in Stockholders' Equity
Net (loss) income	16.3				15.2		1.1
Foreign currency translation	(0.1)			(0.1)
Change in fair value of interest rate collars	(0.8)			(0.8)
Issuance of stock grants (in shares)		14,076
Issuance of stock grants	0.5		0.5
Issuance of restricted stock units (in shares)		11,745
Issuance of restricted stock units	0.0
Non-cash stock-based compensation	1.0		1.0
Treasury stock	(11.3)					(11.3)
Distributions to noncontrolling interest	(0.7)						(0.7)
Ending Balance (in shares) at Jun. 30, 2019		22,879,409
Ending Balance at Jun. 30, 2019	381.9		259.5	(3.1)	146.5	(21.1)	0.1
Increase (Decrease) in Stockholders' Equity
Net (loss) income	15.0				14.2		0.8
Foreign currency translation	(0.1)			(0.1)
Change in fair value of interest rate collars	(0.1)			(0.1)
Issuance of restricted stock units (in shares)		69,357
Issuance of restricted stock units	0.0
Non-cash stock-based compensation	1.3		1.3
Treasury stock	(18.7)					(18.7)
Distributions to noncontrolling interest	(1.0)						(1.0)
Ending Balance (in shares) at Sep. 30, 2019		22,948,766
Ending Balance at Sep. 30, 2019	$ 378.3		260.8	(3.3)	160.6	(39.8)
Beginning balance (in shares) at Dec. 31, 2019	22,950,360	22,950,360
Beginning Balance at Dec. 31, 2019	$ 373.9		262.6	(2.7)	169.5	(55.3)	(0.2)
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(45.6)				(46.1)		0.5
Foreign currency translation	(0.2)			(0.2)
Change in fair value of interest rate collars	(2.8)			(2.8)
Issuance of performance stock units (in shares)		46,701
Issuance of performance stock units	0.0
Non-cash stock-based compensation	(2.9)		(2.9)
Treasury stock	(15.3)					(15.3)
Distributions to noncontrolling interest	(0.5)						(0.5)
Ending Balance (in shares) at Mar. 31, 2020		22,997,061
Ending Balance at Mar. 31, 2020	$ 306.6		259.7	(5.7)	123.4	(70.6)	(0.2)
Beginning balance (in shares) at Dec. 31, 2019	22,950,360	22,950,360
Beginning Balance at Dec. 31, 2019	$ 373.9		262.6	(2.7)	169.5	(55.3)	(0.2)
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(173.7)
Foreign currency translation	(0.3)
Treasury stock	$ (15.3)
Ending Balance (in shares) at Sep. 30, 2020	23,086,792	23,086,792
Ending Balance at Sep. 30, 2020	$ 177.4		258.7	(5.2)	(3.8)	(70.6)	(1.7)
Beginning balance (in shares) at Mar. 31, 2020		22,997,061
Beginning Balance at Mar. 31, 2020	306.6		259.7	(5.7)	123.4	(70.6)	(0.2)
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(39.8)				(39.1)		(0.7)
Foreign currency translation	(0.1)			(0.1)
Change in fair value of interest rate collars	0.2			0.2
Issuance of stock grants (in shares)		25,066
Issuance of stock grants	0.5		0.5
Non-cash stock-based compensation	0.4		0.4
Noncontrolling interest buyout	(1.7)		(1.7)
Distributions to noncontrolling interest	(0.4)						(0.4)
Ending Balance (in shares) at Jun. 30, 2020		23,022,127
Ending Balance at Jun. 30, 2020	265.7		258.9	(5.6)	84.3	(70.6)	(1.3)
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(88.3)				(88.1)		(0.2)
Change in fair value of interest rate collars	0.4			0.4
Issuance of restricted stock units (in shares)		64,665
Issuance of restricted stock units	0.0
Non-cash stock-based compensation	(0.2)		(0.2)
Distributions to noncontrolling interest	$ (0.2)						(0.2)
Ending Balance (in shares) at Sep. 30, 2020	23,086,792	23,086,792
Ending Balance at Sep. 30, 2020	$ 177.4		$ 258.7	$ (5.2)	$ (3.8)	$ (70.6)	$ (1.7)