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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2011
Valuation and Qualifying Accounts

Schedule II: Valuation and Qualifying Accounts

Allowance for Doubtful Accounts (Deducted from Accounts Receivable)

 

(in thousands of U.S. dollars)

    Balance at
Beginning of
Period		      Charged to
Costs and
Expenses		      Deductions (1)      Balance at
End of
Period		  

Year ended December 31, 2011

    $ 12,113       $ 4,024       $ 9,210       $ 6,927   

Year ended December 31, 2010

    $ 7,593       $ 10,138       $ 5,618       $ 12,113   

Year ended December 31, 2009

    $ 9,887       $ 5,732       $ 8,026       $ 7,593   

 

(1) Accounts deemed to be uncollectible.