<TABLE> <S> <C>
<ARTICLE> 5
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-END> JUN-30-2000
<CASH> 1,863
<SECURITIES> 0
<RECEIVABLES> 54,847
<ALLOWANCES> 1,062
<INVENTORY> 0
<CURRENT-ASSETS> 0<F1>
<PP&E> 220,727<F2>
<DEPRECIATION> 65,659
<TOTAL-ASSETS> 559,557
<CURRENT-LIABILITIES> 0<F1>
<BONDS> 227,189
0
0
<COMMON> 243
<OTHER-SE> 251,166
<TOTAL-LIABILITY-AND-EQUITY> 559,557
<SALES> 68,498
<TOTAL-REVENUES> 68,498
<CGS> 3,207
<TOTAL-COSTS> 3,207
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 6,241
<INCOME-PRETAX> 8,094
<INCOME-TAX> 3,723
<INCOME-CONTINUING> 4,371
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 4,371
<EPS-BASIC> .18
<EPS-DILUTED> .18
<FN>
<F1> The Company does not present a classified balance sheet; therefore, current
assets and current liabilities are not reflected in the Company's financial
statements.
<F2> PP&E does not include seismic data bank assets with a cost of $667,456,000
and related accumulated amortization of $325,153,000.
</FN>
</TABLE>