Quarterly report pursuant to Section 13 or 15(d)

Restricted Cash - CTPL Reserve (Details)

v3.3.0.814
Restricted Cash - CTPL Reserve (Details)
Sep. 30, 2015
USD ($)
mi
Dec. 31, 2014
USD ($)
May. 31, 2013
USD ($)
Restricted Cash Items [Line Items]      
Current restricted cash $ 652,225,000 $ 481,737,000  
Non-current restricted cash $ 118,909,000 550,811,000  
CTPL [Member] | Creole Trail Pipeline [Member]      
Restricted Cash Items [Line Items]      
Length of Natural Gas Pipeline, in miles | mi 94    
CTPL [Member] | CTPL Term Loan [Member]      
Restricted Cash Items [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 400,000,000   $ 400,000,000.0
CTPL [Member] | Payment of Liabilities [Member]      
Restricted Cash Items [Line Items]      
Current restricted cash 11,300,000 24,900,000  
CTPL [Member] | Construction And Interest Payments [Member]      
Restricted Cash Items [Line Items]      
Non-current restricted cash $ 0 $ 11,300,000