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Basis of Presentation and Significant Accounting Policies (Details 5) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Recurring Fair Value Measurments [Member] | Total as of Period End [Member]
   
Fair Value Measurements [Line Items]    
Asset for natural gas swap contracts   $ 2,436
Liability for oil swap contracts   (5,208)
Total   (2,772)
Recurring Fair Value Measurments [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Fair Value Measurements [Line Items]    
Asset for natural gas swap contracts   2,436
Liability for oil swap contracts   (5,208)
Nonrecurring Fair Value Measurments [Member] | Total as of Period End [Member]
   
Fair Value Measurements [Line Items]    
Oil and gas properties 3,743 50,339
Offshore Services assets   2,453
Calcium chloride plant   932
Other 246 0
Total 3,989 53,724
Nonrecurring Fair Value Measurments [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value Measurements [Line Items]    
Oil and gas properties 3,743 50,339
Offshore Services assets   2,453
Calcium chloride plant   932
Other 246 0
Nonrecurring Fair Value Measurments [Member] | Year-to-Date Impairment Losses [Member]
   
Fair Value Measurements [Line Items]    
Oil and gas properties 15,233 63,774
Offshore Services assets   17,731
Calcium chloride plant   7,213
Other 505 149
Total $ 15,738 $ 88,867