retained interest is calculated without changing any other assumptions; in reality, changes in one factor may result in changes in  another, which might magnify or counteract the sensitivities. In October 2012, NNN amended and restated its credit agreement increasing the borrowing capacity under its unsecured  revolving credit facility from $450,000,000 to $500,000,000 and amended certain other terms under the former revolving credit  facility (as the context requires, the previous and new revolving credit facility, the “Credit Facility”). The Credit Facility had a  weighted average outstanding balance of $41,402,000 and a weighted average interest rate of 1.4% during the year ended  December 31, 2013. The Credit Facility matures October 2016, with an option to extend maturity to October 2017. As of  December 31, 2013, the Credit Facility bears interest at LIBOR plus 107.5 basis points; however, such interest rate may change  pursuant to a tiered interest rate structure based on NNN's debt rating. The Credit Facility also includes an accordion feature to  increase the facility size up to $1,000,000,000. As of December 31, 2013, $46,400,000 was outstanding and $453,600,000 was  available for future borrowings under the Credit Facility. In accordance with the terms of the Credit Facility, NNN is required to meet certain restrictive financial covenants which,  among other things, require NNN to maintain certain (i) leverage ratios, (ii) debt service coverage, (iii) cash flow coverage and  (iv) investment and dividend limitations. At December 31, 2013, NNN was in compliance with those covenants. The following table outlines the mortgages payable included in NNN’s consolidated financial statements (dollars in thousands): (1)  Each loan is secured by a first mortgage lien on certain of NNN’s properties. The carrying values of the assets are as of December 31,  2013. (2)  Date entered represents the date that NNN acquired real estate subject to a mortgage securing a loan. The corresponding original  principal balance represents the outstanding principal balance at the time of acquisition. (3)  Monthly payments include interest and principal, if any; the balance is due at maturity. (4)  Initial balance and outstanding principal balance includes unamortized premium. The following is a schedule of the annual maturities of NNN’s mortgages payable at December 31, 2013 (dollars in thousands): 2014 $ 1,158 2015 1,207 2016 6,842 2017 147 2018 86 Thereafter 35 $ 9,475  61 Entered Initial Balance Interest Rate Maturity  (3) Carrying Value of Encumbered Asset(s) (1) Outstanding Principal Balance at December 31, 2013 2012 December 2001  (2) $ 623 9.00% April 2014 $ 438 $ 27 $ 95 December 2001  (2) 698 9.00% April 2019 968 263 299 December 2001  (2) 485 9.00% April 2019 936 136 155 February 2004  (2) 6,952 6.90% January 2017 10,797 2,257 2,892 March 2005  (2) 1,015 8.14% September 2016 1,264 335 439 June 2012  (2)(4) 6,850 5.75% April 2016 8,717 6,457 6,722 $ 23,120 $ 9,475 $ 10,602 Note 7 – Mortgages Payable: Note 6 – Line of Credit Payable: