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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2013
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
The financial instruments measured at fair value on a recurring basis are summarized below:
 
 
Fair Value Measurements at December 31, 2013
 
Fair Value Measurements at December 31, 2012
Description
Quoted Prices in
Active Markets
for Identical
Liabilities
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Quoted Prices in
Active Markets
for Identical
Liabilities
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Gas Cash Flow Hedges (Note 23)
$
—

 
$
65,449

 
$
—

 
$
—

 
$
128,945

 
$
—
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Table Text Block]
The carrying amounts and fair values of financial instruments for which the fair value option was not elected are as follows:
 
 
December 31, 2013
 
December 31, 2012
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Cash and cash equivalents
$
327,420

 
$
327,420

 
$
21,862

 
$
21,862

Restricted cash (a)
$
—

 
$
—

 
$
68,673

 
$
68,673

Short-term notes payable
$
—

 
$
—

 
$
(25,073
)
 
$
(25,073
)
Borrowings under securitization facility
$
—

 
$
—

 
$
(37,846
)
 
$
(37,846
)
Long-term debt
$
(3,118,920
)
 
$
(3,299,875
)
 
$
(3,127,726
)
 
$
(3,376,767
)