Basis of Presentation (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Y week segment	Sep. 30, 2010	Dec. 31, 2010
Basis of Presentation
Number of weeks in each fiscal quarter for 52-week fiscal year			13
Income Per Common Share
Basic weighted average shares outstanding (in shares)	39,335	39,946	40,132	39,508
Dilutive effect of stock options and restricted stock (in shares)	734	1,301	983	1,540
Dilutive effect of convertible notes (in shares)		1,011	826	1,127
Diluted weighted average shares outstanding (in shares)	40,069	42,258	41,941	42,175
Derivative Financial Instruments
Aggregate foreign currency exchange gain (loss)	$ (0.2)	$ 0.1	$ (0.7)	$ (0.3)
Forward contracts gains included in aggregate foreign currency exchange gain (loss)	(0.3)	(0.1)	0.5	(0.1)
Losses related to forward contracts included in accrued expenses and other current liabilities	0.1		0.1
Gains related to forward contracts were included in prepaid expenses and other current assets					0.3
Notional amount of monthly forward contracts	1.4		1.4
Weighted average notional amount of derivative contracts	$ 4.6		$ 13.2

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