XML 94 R41.htm IDEA: XBRL DOCUMENT v2.4.0.8
Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 12 Months Ended
Jul. 23, 2013
Jul. 23, 2012
Dec. 31, 2013
item
Dec. 31, 2012
item
Dec. 31, 2011
Summary of Significant Accounting Policies          
Number of operating segments     1    
Stock split ratio declared by the Board of Directors 2 2      
Cash and Cash Equivalents          
Number of financial institutions     2 1  
Properties and Equipment          
Amortization of unproved properties included in depreciation, depletion, and amortization     $ 53.6 $ 18.1 $ 32.5
Assets legally restricted for purposes of settling asset retirement obligations     $ 0    
Gathering and pipeline systems and equipment | Minimum
         
Properties and Equipment          
Estimated useful life     10 years    
Gathering and pipeline systems and equipment | Maximum
         
Properties and Equipment          
Estimated useful life     25 years    
Pipeline and transmission systems | Minimum
         
Properties and Equipment          
Estimated useful life     12 years    
Pipeline and transmission systems | Maximum
         
Properties and Equipment          
Estimated useful life     25 years    
Gathering and compression equipment | Maximum
         
Properties and Equipment          
Estimated useful life     10 years    
Storage equipment and facilities | Minimum
         
Properties and Equipment          
Estimated useful life     10 years    
Storage equipment and facilities | Maximum
         
Properties and Equipment          
Estimated useful life     16 years    
Buildings | Minimum
         
Properties and Equipment          
Estimated useful life     25 years    
Buildings | Maximum
         
Properties and Equipment          
Estimated useful life     40 years    
Other assets | Minimum
         
Properties and Equipment          
Estimated useful life     3 years    
Other assets | Maximum
         
Properties and Equipment          
Estimated useful life     10 years