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Leases (Assets Under Capital Leases) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Leases [Abstract]    
Information systems $ 12,232 $ 3,587
Less: Accumulated amortization (3,065) (2,360)
Total assets under capital leases $ 9,167 $ 1,227