Quarterly report pursuant to Section 13 or 15(d)

Unsecured Lines of Credit Payable - Narrative (Details)

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Unsecured Lines of Credit Payable - Narrative (Details) (Line of Credit, USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Credit Facility No. 1
   
Line of Credit Facility [Line Items]    
Line of Credit Facility, Expiration Date Jun. 30, 2015  
Line of Credit Facility, Maximum Borrowing Capacity $ 100,000 $ 100,000
Borrowings   5,000
Credit Facility No. 2
   
Line of Credit Facility [Line Items]    
Line of Credit Facility, Expiration Date Jul. 31, 2016  
Line of Credit Facility, Maximum Borrowing Capacity 400,000 400,000
Maximum | Credit Facility No. 1
   
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 200,000 200,000
Maximum | Credit Facility No. 2
   
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 600,000 $ 600,000