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Derivative Instruments (Tables)
9 Months Ended
Sep. 30, 2011
Derivative Instruments (Tables) [Abstract] 
Impact of derivative instruments on the statement of operations and OCI
                                         
          Three Months Ended
September 30,
    Nine Months Ended
September 30,
 
    Location     2011     2010     2011     2010  

Gain (loss) on interest rate swap recognized in
OCI (effective portion)

    n/a     $ 658     $ (3,211   $ 2,499     $ (10,307

Gain (loss) reclassified from AOCI into
income (effective portion)

    Interest expense       467       (236     1,440       (1,834

Gain (loss) recognized in income (ineffective portion
and amount excluded from effectiveness testing)

    Realized loss       —         —         —         —