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Indebtedness (Details Textuals) (USD $)
3 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended1 Months Ended9 Months Ended
Sep. 30, 2011
Year
Project
Well
CommercialBank
Jun. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Year
FinancialInstitution
CreditFacility
Project
Well
CommercialBank
Sep. 30, 2010
Oct. 21, 2011
Oct. 12, 2011
Dec. 31, 2010
Sep. 30, 2011
Senior Subordinated Notes [Member]
Jun. 01, 2019
Senior Subordinated Notes [Member]
Jun. 01, 2016
Senior Subordinated Notes [Member]
Sep. 30, 2011
6.375% Senior Subordinated Notes due 2015 [Member]
Jun. 24, 2011
6.375% Senior Subordinated Notes due 2015 [Member]
May 25, 2011
6.375% Senior Subordinated Notes due 2015 [Member]
May 11, 2011
6.375% Senior Subordinated Notes due 2015 [Member]
Dec. 31, 2010
6.375% Senior Subordinated Notes due 2015 [Member]
Sep. 30, 2011
7.5% senior subordinated notes due 2016, net of discount [Member]
Jun. 24, 2011
7.5% senior subordinated notes due 2016, net of discount [Member]
May 25, 2011
7.5% senior subordinated notes due 2016, net of discount [Member]
May 11, 2011
7.5% senior subordinated notes due 2016, net of discount [Member]
Dec. 31, 2010
7.5% senior subordinated notes due 2016, net of discount [Member]
Sep. 30, 2011
7.5% Senior Subordinated Notes due 2017 [Member]
Dec. 31, 2010
7.5% Senior Subordinated Notes due 2017 [Member]
Sep. 30, 2011
7.25% Senior Subordinated Notes due 2018 [Member]
Dec. 31, 2010
7.25% Senior Subordinated Notes due 2018 [Member]
Sep. 30, 2011
8.0% senior subordinated notes due 2019, net of discount [Member]
Dec. 31, 2010
8.0% senior subordinated notes due 2019, net of discount [Member]
Sep. 30, 2011
6.75% Senior Subordinated Notes due 2020 [Member]
Dec. 31, 2010
6.75% Senior Subordinated Notes due 2020 [Member]
May 31, 2011
5.75% Senior Subordinated Notes due 2021 [Member]
Sep. 30, 2011
5.75% Senior Subordinated Notes due 2021 [Member]
Sep. 30, 2011
Maximum [Member]
Sep. 30, 2011
Minimum [Member]
Debt Instrument [Line Items]                                 
Interest rate on senior subordinated notes           6.375%   6.375%7.50%   7.50%7.50%7.50%7.25%7.25%8.00%8.00%6.75%6.75% 5.75%  
Aggregate principal amount of senior subordinated notes              $ 150,000,000    $ 250,000,000         $ 500,000,000   
Net proceeds after underwriting discounts and commissions   500,000,000500,000,000                        491,300,000   
Maximum redemption price of 5.75% notes as a percentage of principal amount        105.75%100.00%102.875%                      
Maximum percentage of the original aggregate amount of the 5.75% notes that can be redeemed        35.00%                        
Minimum percentage of original aggregate principal amount of 5.75% percentage notes to remain outstanding immediately after redemption        65.00%                        
Maximum number of days after the date of the closing of the equity offering that the redemption should occur        60 days                        
Repayment of subordinate debt   413,698,000202,458,000      112,900,000    207,100,000                
Purchase price of senior subordinate notes as a percentage of principal            102.125%102.375%   103.75%104.00%              
Purchase price of senior subordinate notes            41,100,000108,900,000   51,200,000198,800,000              
Line of Credit Facility [Line Items]                                 
Spread for Alternate Base Rate                               1.50%0.50%
Spread for LIBOR Rate                               2.50%1.50%
Annual rate of commitment fee paid on the undrawn balance                               0.50%0.375%
Indebtedness (Textuals) [Abstract]                                 
Interest Costs, Capitalized During Period0 000                            
Bank Credit facility, Borrowing base2,000,000,000  2,000,000,000                             
Bank Credit Facility Amount1,500,000,000  1,500,000,000                             
Reaffirmed borrowing base      2,000,000,000                          
Reaffirmed facility amount      1,500,000,000                          
Number of commercial banks included in current bank group26  26                             
Percentage holding of commercial banks, Maximum7.00%  7.00%                             
Notice period for increase in facility amount   20 days                             
Outstanding balance under the bank credit facility0  0   274,000,000                         
Undrawn letters of credit22,200,000  22,200,000                             
Maturity date of loanFeb. 01, 2016
Borrowing capacity available under the facility amount1,500,000,000  1,500,000,000                             
Weighted average interest rate on the bank credit facility0.00% 2.30%2.20%2.20%                            
Commitment Fee Rate   0.375%                             
Bank Credit Facility, Amount Outstanding     77,000,000                           
Interest rate on bank credit facility     3.75%                           
Ratio of debt to EBITDAX4.25  4.25                             
Current ratio1.0  1.0                             
Loss on early extinguishment of debt$ (4,000)$ 18,600,000$ 5,351,000$ 18,576,000$ 5,351,000