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Mortgages and Notes Payable
3 Months Ended
Mar. 31, 2014
Debt Disclosure [Abstract]  
Mortgages and Notes Payable
Mortgages and Notes Payable

The following table sets forth our mortgages and notes payable:

 
March 31,
2014
 
December 31,
2013
Secured indebtedness
$
485,525

 
$
488,664

Unsecured indebtedness
1,527,029

 
1,467,635

Total mortgages and notes payable
$
2,012,554

 
$
1,956,299



At March 31, 2014, our secured mortgage loans were collateralized by real estate assets with an aggregate undepreciated book value of $817.9 million.

Our $475.0 million unsecured revolving credit facility is scheduled to mature in January 2018 and includes an accordion feature that allows for an additional $75.0 million of borrowing capacity subject to additional lender commitments. Assuming no defaults have occurred, we have an option to extend the maturity for two additional six-month periods. The interest rate at our current credit ratings is LIBOR plus 110 basis points and the annual facility fee is 20 basis points. There was $275.0 million and $409.0 million outstanding under our revolving credit facility at March 31, 2014 and April 21, 2014, respectively. At both March 31, 2014 and April 21, 2014, we had $0.1 million of outstanding letters of credit, which reduces the availability on our revolving credit facility. As a result, the unused capacity of our revolving credit facility at March 31, 2014 and April 21, 2014 was $199.9 million and $65.9 million, respectively.

We are currently in compliance with financial covenants and other requirements with respect to our consolidated debt.