Basis of Presentation (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 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)	40,998	39,761	40,433	39,283
Dilutive effect of stock options and restricted stock (in shares)	1,066	2,327	1,108	1,215
Dilutive effect of convertible notes (in shares)	938	1,418	1,239	1,185
Diluted weighted average shares outstanding (in shares)	43,002	43,506	42,780	41,683
Derivative Financial Instruments
Aggregate foreign currency exchange gain (loss)	$ (0.1)	$ (0.5)	$ (0.4)	$ (0.4)
Forward contracts gains included in aggregate foreign currency exchange gain	0.3	0.1	0.8	0.1
Losses related to forward contracts included in accrued expenses and other current liabilities are less than this amount	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	3.9		3.9
Weighted average notional amount of derivative contracts	$ 20.5		$ 17.4

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