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Quarterly report pursuant to Section 13 or 15(d)

Lease Obligations (Narrative) (Details)

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Lease Obligations (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Lease Obligations [Abstract] Ìý Ìý
Operating lease expense $ 6.3 $ 5.8