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Summary of Significant Accounting Policies (Deferred Financing Costs) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of Significant Accounting Policies [Abstract]      
Deferred financing costs $ 24,821 $ 27,674  
Amortization expense 10,391 12,933 12,223
Accumulated amortization $ 8,932 $ 17,781