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Other Non-Operating Expense (Details) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Other Non-Operating Expense        
Early redemption call premium $ 0 $ 0 $ 0 $ (14,115)
Write-off of unamortized offering costs 0 0 0 (4,076)
Dividend received 0 7,642 0 7,642
Other gains / (losses) (2,661) (1,004) (3,637) (803)
Total other non operating income / (expense), net $ (2,661) $ 6,638 $ (3,637) $ (11,352)