ventas , inc . notes to consolidated financial statements 2014 ( continued ) if we experience certain kinds of changes of control , the issuers must make an offer to repurchase the senior notes , in whole or in part , at a purchase price in cash equal to 101% ( 101 % ) of the principal amount of the senior notes , plus any accrued and unpaid interest to the date of purchase ; provided , however , that in the event moody 2019s and s&p have confirmed their ratings at ba3 or higher and bb- or higher on the senior notes and certain other conditions are met , this repurchase obligation will not apply . mortgages at december 31 , 2006 , we had outstanding 53 mortgage loans that we assumed in connection with various acquisitions . outstanding principal balances on these loans ranged from $ 0.4 million to $ 114.4 million as of december 31 , 2006 . the loans bear interest at fixed rates ranging from 5.6% ( 5.6 % ) to 8.5% ( 8.5 % ) per annum , except with respect to eight loans with outstanding principal balances ranging from $ 0.4 million to $ 114.4 million , which bear interest at the lender 2019s variable rates , ranging from 3.6% ( 3.6 % ) to 8.5% ( 8.5 % ) per annum at of december 31 , 2006 . the fixed rate debt bears interest at a weighted average annual rate of 7.06% ( 7.06 % ) and the variable rate debt bears interest at a weighted average annual rate of 5.61% ( 5.61 % ) as of december 31 , 2006 . the loans had a weighted average maturity of eight years as of december 31 , 2006 . the $ 114.4 variable mortgage debt was repaid in january 2007 . scheduled maturities of borrowing arrangements and other provisions as of december 31 , 2006 , our indebtedness has the following maturities ( in thousands ) : .
what percentage of total maturities amortize after 2011?
certain provisions of our long-term debt contain covenants that limit our ability and the ability of certain of our subsidiaries to , among other things : ( i ) incur debt ; ( ii ) make certain dividends , distributions and investments ; ( iii ) enter into certain transactions ; ( iv ) merge , consolidate or transfer certain assets ; and ( v ) sell assets . we and certain of our subsidiaries are also required to maintain total unencumbered assets of at least 150% ( 150 % ) of this group 2019s unsecured debt . derivatives and hedging in the normal course of business , we are exposed to the effect of interest rate changes . we limit these risks by following established risk management policies and procedures including the use of derivatives . for interest rate exposures , derivatives are used primarily to fix the rate on debt based on floating-rate indices and to manage the cost of borrowing obligations . we currently have an interest rate swap to manage interest rate risk ( the 201cswap 201d ) . we prohibit the use of derivative instruments for trading or speculative purposes . further , we have a policy of only entering into contracts with major financial institutions based upon their credit ratings and other factors . when viewed in conjunction with the underlying and offsetting exposure that the derivative is designed to hedge , we do not anticipate any material adverse effect on our net income or financial position in the future from the use of derivatives. .