Interest expense relating to the long-term debt totaled $ 2 . 4  million, $ 3 . 2  million and $ 5 . 9  million for the years ended  December  31 ,  2002 ,  2003  and  2004 , respectively. The notes and shelf facility contain other terms and conditions and affirmative and negative financial covenants cus- tomary for credit facilities of this type. As of December  31 ,  2004 , the Company is in compliance with all financial covenants  under the notes and shelf facility. Maturities of all long-term debt at December  31 ,  2004 , based on the year-end exchange rate, are as follows  (U.S. dollars in thousands): The Company leases office space and computer hardware under noncancelable long-term operating leases including related  party leases (see Note  3 ). Most leases include renewal options of at least three years. Minimum future operating lease ob- ligations at December  31 ,  2004  are as follows (U.S. dollars in thousands): Rental expense for operating leases totaled $ 21 . 0  million, $ 24 . 2  million and $ 25 . 9  million for the years ended Decem- ber  31 ,  2002 ,  2003  and  2004 , respectively. The Company’s authorized capital stock consists of  25  million shares of preferred stock, par value $. 001  per share,  500 million shares of Class A common stock, par value $. 001  per share and  100  million shares of Class B common stock, par  value $. 001  per share. The shares of Class A common stock and Class B common stock are identical in all respects, except  for voting rights and certain conversion rights and transfer restrictions, as follows: ( 1 ) each share of Class A common stock  entitles the holder to one vote on matters submitted to a vote of the Company’s stockholders and each share of Class B com- mon stock entitles the holder to ten votes on each such matter; ( 2 ) stock dividends of Class A common stock may be paid  only to holders of Class A common stock and stock dividends of Class B common stock may be paid only to holders of Class  B common stock; ( 3 ) if a holder of Class B common stock transfers such shares to a person other than a permitted transferee,  as defined in the Company’s Certificate of Incorporation, such shares will be converted automatically into shares of Class  A common stock; and ( 4 ) Class A common stock has no conversion rights; however, each share of Class B common stock is  convertible into one share of Class A common stock, in whole or in part, at any time at the option of the holder. All Class B  shares have been converted to Class A shares.  10 . CAPITAL STOCK 9 . LEASE OBLIGATIONS 63 Year Ending December  31 , 2005 $  18 , 540 2006 28 , 540 2007 28 , 540 2008 28 , 540 2009 23 , 540 Thereafter 23 , 541 Total $  151 , 241 Year Ending December  31 , 2005 $  12 , 989 2006 12 , 614 2007 12 , 733 2008 12 , 889 2009 12 , 054 Thereafter 5 , 564 Total minimum lease payments $  68 , 843