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Property And Equipment (Summary Of Oil And Gas Properties Not Subject To Amortization) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]        
Acquisition costs $ 621,519 $ 361,167 $ 273,146 $ 522,872
Acquisition costs, total 1,778,704      
Exploration costs 0 0 0 0
Exploration costs, total 0      
Development costs 28,833 4,688 1,436 457
Development costs, total 35,414      
Capitalized interest 3,674 (2,353) 2,262 0
Capitalized interest, total 3,583      
Total oil and gas properties not subject to amortization 654,026 363,502 $ 276,844 $ 523,329
Total oil and gas properties not subject to amortization, total 1,817,701 $ 1,465,538    
Utica        
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]        
Total oil and gas properties not subject to amortization, total 1,812,256      
Niobrara        
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]        
Total oil and gas properties not subject to amortization, total 4,932      
Southern Louisiana        
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]        
Total oil and gas properties not subject to amortization, total 372      
Bakken        
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]        
Total oil and gas properties not subject to amortization, total 96      
Other        
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]        
Total oil and gas properties not subject to amortization, total $ 45