Three Months Ended          Six Months Ended
------------------------------------------------   -----------------------
(unaudited) in thousands
 except per share           June 30,     June 30,     June 30,     June 30,
 amounts                       2007         2006         2007         2006
------------------------------------------------   -----------------------
Revenues                 $   93,210   $   81,318   $  147,456   $  108,633
Operating Income         $   27,337   $   41,908   $   41,070   $   48,465
Net Income               $    3,224   $   26,565   $    1,302   $   27,225
Net Income Per Share     $     0.10   $     0.89   $     0.04   $     0.93
Adjusted Net Income(1)   $   19,482   $   20,023   $   30,190   $   22,785
Adjusted Net Income Per
 Share(1)                $     0.62   $     0.67   $     0.97   $     0.78
Cash Flow(1)             $   24,412   $   13,235   $   46,468   $   15,211
Cash Flow Per Share(1)   $     0.78   $     0.44   $     1.50   $     0.52
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(1) Adjusted Net Income, Adjusted Net Income Per Share, Cash flow and Cash
    Flow Per Share are measures used by the Company to evaluate its
    performance; however, they are not terms recognized under generally
    accepted accounting principles. Adjusted Net Income is defined as net
    income adjusted for certain items of a non-operational nature that
    pertain to future periods as described in further detail in the
    Management's Discussion and Analysis under the heading Adjusted Net
    Income. Cash Flow is defined as cash flow from operations before net
    change in working capital balances. Adjusted Net Income and Cash Flow
    Per Share are the same measures divided by the weighted average number
    of common shares outstanding during the period.