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Minimum Lease Commitments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Leases [Line Items]      
Operating Leases, Rent Expense, Net $ 7.9 $ 7.9 $ 6.2
Operating Leases, Income Statement, Lease Revenue $ 4.7 $ 3.8 $ 2.4