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Fair Value (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Assets:    
Assets held for sale $ 7,860 $ 12,224
Derivative financial instruments (asset) 218 253
Liabilities:    
Derivative financial instruments (liability) 1,626 1,772
Fixed-rate debt 469,604 358,590
Asset transfers between Level 1 to Level 2 0  
Asset transfers between Level 2 to Level 1 0  
Liability transfers between Level 1 to Level 2 0  
Liability transfers between Level 2 to Level 1 0  
Recurring basis | Level 2
   
Assets:    
Assets held for sale 7,860 12,224
Liabilities:    
Fixed-rate debt 353,076 319,429
Recurring basis | Level 2 | Interest rate swaps
   
Assets:    
Derivative financial instruments (asset) 218 253
Liabilities:    
Derivative financial instruments (liability) 1,626 1,772
Recurring basis | Total fair value
   
Assets:    
Assets held for sale 7,860 12,224
Liabilities:    
Fixed-rate debt 353,076 319,429
Recurring basis | Total fair value | Interest rate swaps
   
Assets:    
Derivative financial instruments (asset) 218 253
Liabilities:    
Derivative financial instruments (liability) $ 1,626 $ 1,772