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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Assets:    
Interest Rate Derivative Assets, at Fair Value   $ 3,919
Level 1[Member] | Demand Obligation [Member]
   
Assets:    
Interest Rate Derivative Assets, at Fair Value   0
Level 1[Member] | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Interest Rate Derivative Assets, at Fair Value 0  
Assets, Fair Value Disclosure 0 0
Liabilities:    
Interest rate derivative financial instruments 0 0
Liabilities, Fair Value Disclosure 0 0
Level 2 [Member] | Demand Obligation [Member]
   
Assets:    
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure 74  
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Interest Rate Derivative Assets, at Fair Value 536 3,919
Assets, Fair Value Disclosure 610 3,919
Liabilities:    
Interest rate derivative financial instruments 27,271 26,078
Liabilities, Fair Value Disclosure 27,271 26,078
Total | Demand Obligation [Member]
   
Assets:    
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure 74  
Total | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Interest Rate Derivative Assets, at Fair Value 536 3,919
Assets, Fair Value Disclosure 610 3,919
Liabilities:    
Interest rate derivative financial instruments 27,271 26,078
Liabilities, Fair Value Disclosure $ 27,271 $ 26,078