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Subsequent Events (Details) (USD $)
 3 Months Ended 0 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Apr. 02, 2014
Subsequent events
Partnership
Apr. 10, 2014
Subsequent events
Partnership
MidCon
Apr. 07, 2014
Subsequent events
Partnership
Partnership 2014 Notes
Subsequent events          
Sale of common units (in shares)     6,210,000    
Common units to cover over-allotments (in shares)     810,000    
Net proceeds from the sale of Partnership units     $ 169,500,000    
Proceeds from issuance of general partner units     3,600,000    
General partner units issued (in shares)     126,000    
Approximate general partner interest in limited partnership (as a percent)     2.00%    
Principle amount of senior notes         350,000,000
Interest rate (as a percent)         6.00%
Net proceeds from borrowings of long-term debt 332,500,000 1,204,037,000     337,400,000
Amount of original issuance discount on notes         5,700,000
Effective interest rate (as a percent)         6.25%
Transaction costs         6,900,000
Maximum period for registration of notes pursuant to registration rights agreement after April 7, 2014         365 days
Total cash consideration       362,800,000  
Assets acquired by parent company       $ 9,400,000