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Mortgages and Notes Payable
3 Months Ended
Mar. 31, 2015
Debt Disclosure [Abstract]  
Mortgages and Notes Payable
Mortgages and Notes Payable
 
The following table sets forth our mortgages and notes payable:
 
 
March 31,
2015
 
December 31,
2014
Secured indebtedness
$
311,502

 
$
312,868

Unsecured indebtedness
1,777,724

 
1,758,521

Total mortgages and notes payable
$
2,089,226

 
$
2,071,389


 
At March 31, 2015, our secured mortgage loans were collateralized by real estate assets with an aggregate undepreciated book value of $583.2 million.
 

6.    Mortgages and Notes Payable - Continued
 
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 $228.0 million and $239.0 million outstanding under our revolving credit facility at March 31, 2015 and April 20, 2015, respectively. At both March 31, 2015 and April 20, 2015, we had $0.2 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, 2015 and April 20, 2015 was $246.8 million and $235.8 million, respectively.

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