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Commitments and Contingencies Commitments and Contingencies (Details)
MMcf in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
MMcf
MMBbls
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
MMcf
Drilling Rig Leasing Contracts [Member]      
Other Commitments [Line Items]      
Gain (Loss) on Contract Termination $ (5.0) $ (3.2)  
Gas gathering and Oil and Gas Through-put Commitments [Member]      
Other Commitments [Line Items]      
Contractual Obligation, Amended Gathering Agreements Related to Non-Operated Eagle Ford Assets 351.2    
Contractual Payments Receivable, Amended Gathering Agreements Related to Non-Operated Eagle Ford Assets 247.9    
Decrease in Contractual Obligation     $ 118.2
Contractual Obligation $ 1,100.0    
Crude Oil Transportation Commitment [Member]      
Other Commitments [Line Items]      
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume on Amended Gathering Agreements Related to Non-Operated Eagle Ford Assets | MMBbls 40    
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume | MMBbls 75    
Natural Gas Transportation Commitment [Member]      
Other Commitments [Line Items]      
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume on Amended Gathering Agreements Related to Non-Operated Eagle Ford Assets | MMcf 303    
Oil and Gas Delivery Commitments and Contracts, Decrease in Remaining Contractual Volume | MMcf     829
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume | MMcf 1,624    
Natural Gas Liquids Transportation Commitment [Member]      
Other Commitments [Line Items]      
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume | MMBbls 14