Quarterly report pursuant to Section 13 or 15(d)

Schedule of Fair Value of Derivatives (Details)

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Schedule of Fair Value of Derivatives (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Fair Value of Derivatives $ (10,331)  
Interest rate caps, not designated as hedges
   
Fair Value of Derivatives 176 165
Fair Value of Derivatives, Balance Sheet Location Derivative Assets Derivative Assets
Total Asset Derivatives
   
Fair Value of Derivatives 176 165
Interest rate swaps, designated as hedges
   
Fair Value of Derivatives 10,331 12,175
Fair Value of Derivatives, Balance Sheet Location Derivative Liabilities Derivative Liabilities
Interest rate swaps, not designated as hedges
   
Fair Value of Derivatives 16,281 19,401
Fair Value of Derivatives, Balance Sheet Location Derivative Liabilities Derivative Liabilities
Total Liability Derivatives
   
Fair Value of Derivatives $ 26,612 $ 31,576