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Disclosures About Fair Value Measurements (Fair Values Of The Company's Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2008
Dec. 31, 2011
5.875% Senior Notes Due 2016 [Member]
Dec. 31, 2010
5.875% Senior Notes Due 2016 [Member]
Dec. 31, 2011
6.65% Senior Notes Due 2017 [Member]
Dec. 31, 2010
6.65% Senior Notes Due 2017 [Member]
Dec. 31, 2011
6.875% Senior Notes Due 2018 [Member]
Dec. 31, 2010
6.875% Senior Notes Due 2018 [Member]
Dec. 31, 2011
7.50% Senior Notes Due 2020 [Member]
Dec. 31, 2010
7.50% Senior Notes Due 2020 [Member]
Dec. 31, 2011
7.20% Senior Notes Due 2028 [Member]
Dec. 31, 2010
7.20% Senior Notes Due 2028 [Member]
Dec. 31, 2011
2.875% Convertible Senior Notes Due 2038 [Member]
Dec. 31, 2010
2.875% Convertible Senior Notes Due 2038 [Member]
Dec. 31, 2011
Commodity Derivatives [Member]
Dec. 31, 2010
Commodity Derivatives [Member]
Dec. 31, 2011
Trading Securities [Member]
Dec. 31, 2010
Trading Securities [Member]
Dec. 31, 2011
Deferred Compensation Plan Assets [Member]
Dec. 31, 2010
Deferred Compensation Plan Assets [Member]
Dec. 31, 2011
Liability Awards [Member]
Dec. 31, 2010
Liability Awards [Member]
Dec. 31, 2010
Pioneer Credit Facility [Member]
Dec. 31, 2011
Pioneer Southwest Credit Facility [Member]
Dec. 31, 2010
Pioneer Southwest Credit Facility [Member]
Dec. 31, 2011
Interest Rate Derivatives [Member]
Dec. 31, 2010
Interest Rate Derivatives [Member]
Assets                                                    
Carrying Value                           $ 482,075 $ 304,434 $ 425 $ 467 $ 39,904 $ 36,162             $ 18,256
Fair Value                           482,075 304,434 425 467 39,904 36,162             18,256
Liabilities                                                    
Carrying Value   405,388 396,880 484,185 484,045 449,225 449,192 446,716 446,433 249,928 249,925 461,463 [1] 444,994 [1] 92,322 136,867         9,207 4,900 49,000 32,000 81,200 15,654 704
Fair Value   $ 488,445 $ 475,194 $ 546,931 $ 516,632 $ 505,688 $ 480,969 $ 523,373 $ 494,145 $ 269,125 $ 259,350 $ 739,630 [1] $ 728,400 [1] $ 92,322 $ 136,867         $ 9,207 $ 4,900 $ 58,382 $ 32,393 $ 77,241 $ 15,654 $ 704
Senior Notes, interest rate, percentage 2.875% 5.875%   6.65%   6.875%   7.50%   7.20%   2.875%                            
Debt instrument expiration date   2016   2017   2018   2020   2028   2038                            
[1] The fair value of the 2.875% convertible senior notes include the fair value of the conversion privilege.