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Long-Term Debt (Tables)
6 Months Ended
Jun. 30, 2012
Schedule Of Long-Term Debt Interest Rate

Ratio of Total Outstanding Borrowings to Borrowing Base

   Applicable Margin
for LIBOR Loans
  Applicable Margin
for ABR Loans

Less than .25 to 1

   1.50%   0.00%

Greater than or equal to .25 to 1 but less than .50 to 1

   1.75%   0.25%

Greater than or equal to .50 to 1 but less than .75 to 1

   2.00%   0.50%

Greater than or equal to .75 to 1 but less than .90 to 1

   2.25%   0.75%

Greater than .90 to 1 but less than or equal 1

   2.50%   1.00%