<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from Form 10-Q
as of June 30, 1996 and is qualified in its entirety by reference to such
financial statements.
</LEGEND>
       
                                                  
<PERIOD-TYPE>                   3-MOS                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1996
<PERIOD-START>                             APR-01-1996             JAN-01-1996
<PERIOD-END>                               JUN-30-1996             JUN-30-1996
<CASH>                                               0                       0
<SECURITIES>                                         0                       0
<RECEIVABLES>                                  187,593<F1>             187,593<F1>
<ALLOWANCES>                                         0                       0
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                               230,486                 230,486
<PP&E>                                         542,545                 542,545
<DEPRECIATION>                                 192,076                 192,076
<TOTAL-ASSETS>                                 969,941                 969,941
<CURRENT-LIABILITIES>                          170,714                 170,714
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                     43,082                  43,082
<COMMON>                                           723                     723
<OTHER-SE>                                     335,411                 335,411
<TOTAL-LIABILITY-AND-EQUITY>                   969,941                 969,941
<SALES>                                              0                       0
<TOTAL-REVENUES>                               269,419                 519,978
<CGS>                                                0                       0
<TOTAL-COSTS>                                  157,666                 306,253
<OTHER-EXPENSES>                                77,072                 147,879
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                               7,513                  15,162
<INCOME-PRETAX>                                 27,168                  50,684
<INCOME-TAX>                                     9,509                  17,739
<INCOME-CONTINUING>                             17,659                  32,945
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    17,659                  32,945
<EPS-PRIMARY>                                     0.20                    0.38
<EPS-DILUTED>                                     0.20                    0.38
<FN>
<F1>Trade accounts receivable; less allowance for doubtful accounts
</FN>