Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Deferred Financing Costs (Details)

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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
Accounting Policies [Abstract]      
Gross Carrying Value $ 19,622 $ 16,131  
Accumulated Amortization 8,902 7,580  
Net 10,720 8,551  
Amortization of deferred financing costs $ 2,478 $ 2,262 $ 2,413