Consolidated Statements of Stockholders' Equity and Comprehensive Income (USD $) In Millions, except Share data	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total Comprehensive Income (Loss) [Member]
Total stockholders' equity at Dec. 31, 2008	$ 273.6	$ 0.1	$ 209.3	$ (11.0)	$ 82.3	$ (7.1)
Treasury stock (shares) at Dec. 31, 2008				(400,000)
Common stock issued (shares) at Dec. 31, 2008		10,700,000
Net income	47.3				47.3		47.3
Stock-based compensation expense	5.1		5.1
Cash proceeds from exercise of common stock options and warrants	2.2		2.2
Minimum pension liability adjustment, net of taxes	2.4					2.4	2.4
Excess tax deductions associated with stock-based compensation	0.1		0.1
Issuance of stock based instruments, net of shares withheld for employee taxes	(0.5)		(0.5)
Issuance of stock based instruments, net of shares withheld for employee taxes (shares)		300,000
Repurchases of common stock	(2.2)			(2.2)
Repurchases of common stock (shares)				(100,000)
Foreign currency translation adjustment	2.2					2.2	2.2
Total comprehensive income							51.9
Total stockholders' equity at Dec. 31, 2009	330.2	0.1	216.2	(13.2)	129.6	(2.5)
Treasury stock (shares) at Dec. 31, 2009				(500,000)
Common stock issued (shares) at Dec. 31, 2009		11,000,000
Net income	17.7				17.7		17.7
Stock-based compensation expense	4.8		4.8
Cash proceeds from exercise of common stock options and warrants	8.3		8.3
Cash proceeds from exercise of common stock options and warrants (shares)		500,000
Minimum pension liability adjustment, net of taxes	0.2					0.2	0.2
Excess tax deductions associated with stock-based compensation	2.0		2.0
Issuance of stock based instruments, net of shares withheld for employee taxes	(1.7)		(1.7)
Issuance of stock based instruments, net of shares withheld for employee taxes (shares)		100,000
Foreign currency translation adjustment	1.2					1.2	1.2
Total comprehensive income							19.1
Total stockholders' equity at Dec. 31, 2010	362.7	0.1	229.6	(13.2)	147.3	(1.1)
Treasury stock (shares) at Dec. 31, 2010	(495,362)			(500,000)
Common stock issued (shares) at Dec. 31, 2010	11,613,525	11,600,000
Net income	26.2				26.2		26.2
Dividends declared	(1.9)				(1.9)
Stock-based compensation expense	5.1		5.1
Cash proceeds from exercise of common stock options and warrants	5.4		5.4
Cash proceeds from exercise of common stock options and warrants (shares)		700,000
Minimum pension liability adjustment, net of taxes	(2.7)					(2.7)	(2.7)
Excess tax deductions associated with stock-based compensation	1.7		1.7
Issuance of stock based instruments, net of shares withheld for employee taxes	(1.7)		(1.7)
Issuance of stock based instruments, net of shares withheld for employee taxes (shares)		100,000
Repurchases of common stock	(19.0)			(19.0)
Repurchases of common stock (shares)				(500,000)
Foreign currency translation adjustment	(0.3)					(0.3)	(0.3)
Total comprehensive income							23.2
Total stockholders' equity at Dec. 31, 2011	$ 375.5	$ 0.1	$ 240.1	$ (32.2)	$ 171.6	$ (4.1)
Treasury stock (shares) at Dec. 31, 2011	(1,037,777)			(1,000,000)
Common stock issued (shares) at Dec. 31, 2011	12,382,724	12,400,000