Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Accumulated Deficit)	Treasury Stock	Noncontrolling Interest
Beginning balance (deficit) (in shares) at Dec. 31, 2013		21,977,311
Beginning balance (deficit) at Dec. 31, 2013	$ 203.7	$ 0.0	$ 240.7	$ 0.1	$ (37.7)		$ 0.6
Increase (Decrease) in Stockholders' Equity
Net income	26.1				23.1		3.0
Foreign currency translation adjustments	(0.2)			(0.2)
Effective portion of cash flow hedge	(0.2)			(0.2)
Issuance of stock grants (in shares)		19,336
Issuance of stock grants	0.5		0.5
Vested restricted stock units (in shares)		131,078
Vested restricted stock units	0.0
Non-cash stock-based compensation related to restricted stock units and performance share units	2.8		2.8
Tax benefit from exercise of stock options	(0.1)		(0.1)
Distribution to noncontrolling interest	(2.9)						(2.9)
Ending balance (deficit) (in shares) at Dec. 31, 2014		22,127,725
Ending balance (deficit) at Dec. 31, 2014	229.8	$ 0.0	243.9	(0.2)	(14.6)	0.0	0.7
Increase (Decrease) in Stockholders' Equity
Net income	20.3				17.4		2.9
Foreign currency translation adjustments	(0.7)			(0.7)
Effective portion of cash flow hedge	(0.2)			(0.2)
Issuance of stock grants (in shares)		29,305
Issuance of stock grants	0.7		0.7
Vested restricted stock units (in shares)		164,447
Vested restricted stock units	0.0
Non-cash stock-based compensation related to restricted stock units and performance share units	3.0		3.0
Proceeds from exercise of stock options (in shares)		7,101
Proceeds from exercise of stock options	0.0
Tax benefit from vesting of restricted stock	0.3		0.3
Distribution to noncontrolling interest	$ (3.1)						(3.1)
Ending balance (deficit) (in shares) at Dec. 31, 2015	22,328,578	22,328,578
Ending balance (deficit) at Dec. 31, 2015	$ 250.1	$ 0.0	247.9	(1.1)	2.8	0.0	0.5
Increase (Decrease) in Stockholders' Equity
Net income	26.0				23.1		2.9
Foreign currency translation adjustments	(0.2)			(0.2)
Effective portion of cash flow hedge	(0.1)			(0.1)
Issuance of stock grants (in shares)		26,593
Issuance of stock grants	0.6		0.6
Vested restricted stock units (in shares)		1,415
Vested restricted stock units	0.0
Non-cash stock-based compensation related to restricted stock units and performance share units	2.7		2.7
Treasury stock	(7.5)					(7.5)
Distribution to noncontrolling interest	$ (3.3)						(3.3)
Ending balance (deficit) (in shares) at Dec. 31, 2016	22,356,586	22,356,586
Ending balance (deficit) at Dec. 31, 2016	$ 268.4	$ 0.0	$ 251.2	$ (1.4)	$ 25.9	$ (7.5)	$ 0.2