Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Contingencies) (Details)

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Commitments and Contingencies (Contingencies) (Details) (USD $)
In Millions, unless otherwise specified
0月结束 36个月结束 1月结束 0月结束 4个月结束 0月结束
4月. 20, 2009
Louisiana Department of Revenue Tax Litigation [Member]
12月. 31, 2007
Louisiana Department of Revenue Tax Litigation [Member]
12月. 31, 2010
Louisiana Department of Revenue Tax Litigation [Member]
诉讼
11月. 30, 2006
Cudd Pressure Control Litigation [Member]
被告
12月. 09, 2010
Reed Litigation [Member]
被告
原告
英亩
7月. 31, 2010
Reed Litigation [Member]
原告
12月. 07, 2010
Reed Litigation [Member]
被告
英亩
12月. 06, 2010
Reed Litigation [Member]
英亩
7月. 31, 2010
Individual Counterparty [Member]
Reed Litigation [Member]
原告
7月. 31, 2010
Limited Liability Company [Member]
Reed Litigation [Member]
原告
Loss Contingencies [Line Items]                    
所谓遣散税   $ 1.8                
诉讼金额 $ 2.3                  
Number of pending claims     2              
被告人数       6 6 15 21      
原告人数         4       6 1
Original number of 英亩age in litigation               240    
Amended number of 英亩age in litigation             1,700