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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2012
Unit
Jun. 30, 2012
Dec. 31, 2012
Unit
Dec. 31, 2011
Dec. 31, 2010
Summary Of Significant Accounting Policies [Line Items]          
Number of daywork contracts     27    
Book overdrafts $ 7,000,000   $ 7,000,000 $ 26,500,000  
Concentration of cash 40,400,000   40,400,000 31,100,000  
Minimum depreciation percentage for idle drilling rigs     20.00%    
Impairment of Long-Lived Assets Held-for-use 1,200,000   1,200,000    
Goodwill impairment     0 0 0
Additions to goodwill     0 0 0
Goodwill deductible for tax purposes 4,800,000   4,800,000 5,700,000 6,500,000
Intangible asset impairment     0 0 0
Amortization on intangible assets     1,200,000 1,200,000 2,600,000
Accumulated amortization on intangible assets 17,300,000   17,300,000 16,100,000  
Amortization to be recorded in 2013 on intangible assets 700,000   700,000    
Directly related overhead costs capitalized 17,600,000   17,600,000 15,600,000 13,400,000
Average rates used for depreciation, depletion and amortization per Boe     14.70 15.06 11.94
Undeveloped leasehold properties excluded from DD&A calculation 521,659,000   521,659,000    
Future discounted net cash flows discounted     10.00%    
Impairment of oil and natural gas properties 167,700,000 115,900,000 283,606,000 0 0
Non-cash ceiling test write-down net of tax 104,400,000 72,100,000      
Effects of cash flow hedges 29,800,000 32,500,000 29,800,000    
Elimination of inter-segment revenue     49,600,000 52,200,000 40,100,000
Eliminated associated operating expense     34,100,000 32,600,000 31,000,000
Eliminated yielding     15,500,000 19,600,000 9,100,000
Number of partnerships 16   16    
Minimum [Member]
         
Summary Of Significant Accounting Policies [Line Items]          
Number of days for drilling of one well     20 days    
Duration length of contracts     0 years 6 months    
Insurance coverage 50,000   50,000    
Maximum [Member]
         
Summary Of Significant Accounting Policies [Line Items]          
Number of days for drilling of one well     90 days    
Duration length of contracts     3 years    
Insurance coverage 1,500,000   1,500,000    
Under-Produced Properties [Member]
         
Summary Of Significant Accounting Policies [Line Items]          
Natural gas balancing (MMcf) 5,100   5,100    
Over-Produced Properties [Member]
         
Summary Of Significant Accounting Policies [Line Items]          
Natural gas balancing (MMcf) 4,550   4,550    
Natural Gas Balancing [Member]
         
Summary Of Significant Accounting Policies [Line Items]          
Accounts receivable 2,400,000   2,400,000    
Liability recognized to under production $ 3,800,000   $ 3,800,000    
Jul'12 - Dec'12 [Member]
         
Summary Of Significant Accounting Policies [Line Items]          
Portion of Future Oil and Gas Production Being Hedged, as of the Reporting Period (MMBoe)   2.9      
Jan'13 - Dec'13 [Member]
         
Summary Of Significant Accounting Policies [Line Items]          
Portion of Future Oil and Gas Production Being Hedged, as of the Reporting Period (MMBoe) 6.9 4.5 6.9    
Property, Plant and Equipment, Other Types [Member] | Minimum [Member]
         
Summary Of Significant Accounting Policies [Line Items]          
Useful Life, years     3 years    
Property, Plant and Equipment, Other Types [Member] | Maximum [Member]
         
Summary Of Significant Accounting Policies [Line Items]          
Useful Life, years     15 years    
Drilling Equipment [Member] | Minimum [Member]
         
Summary Of Significant Accounting Policies [Line Items]          
Useful Life, years     15 years