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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): 

## 9 . LEASE OBLIGATIONS 

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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): 

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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. 

## 10 . CAPITAL STOCK 

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. 

