Basis of Presentation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2012 W	Mar. 31, 2011
Basis of Presentation
Number of weeks in each fiscal quarter for 52-week fiscal year	13
Income Per Common Share
Basic (in shares)	38,261,000	39,842,000
Dilutive effect of stock options and restricted stock (in shares)	602,000	1,149,000
Dilutive effect of convertible notes (in shares)		1,540,000
Diluted weighted average shares outstanding (in shares)	38,863,000	42,531,000
Dilutive effect of assumed conversion of convertible debt (in shares)		1,500,000
Derivative Financial Instruments
Aggregate foreign currency exchange gain (loss)	$ (0.1)	$ (0.3)
Forward contracts gains included in aggregate foreign currency exchange gain	0.1	0.5
Gains related to forward contracts were included in prepaid expenses and other current assets	0.1
Notional amount of monthly forward contracts	3.3
Weighted average notional amount of derivative contracts	$ 2.4

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