Annual report pursuant to Section 13 and 15(d)

Share-Based And Cash-Based Incentive Compensation (Schedule Of Incentive Compensation Expense) (Details)

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Share-Based And Cash-Based Incentive Compensation (Schedule Of Incentive Compensation Expense) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense charged to operating income (loss) $ 9,710 $ 5,533 $ 7,730
Cash-based incentive compensation charged to operating income (loss) 15,913 10,606 2,997
Total incentive compensation charged to operating income (loss) 25,623 16,139 10,727
Lease Operating Expense [Member]
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense charged to operating income (loss) 466 748 2,242
Cash-based incentive compensation charged to operating income (loss) 3,700 2,067 1,472
General And Administrative [Member]
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense charged to operating income (loss) 9,244 4,785 5,488
Cash-based incentive compensation charged to operating income (loss) $ 12,213 $ 8,539 $ 1,525