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Fair Value (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The following tables summarize the carrying amounts, fair values and fair value measurements recorded or disclosed as of December 31, 2017 and June 30, 2018 based on the three levels established by ASC 820, Fair Value Measurements and Disclosures (in thousands):
 
 
December 31, 2017
Assets (Liabilities)
 
 
 
 
 
Fair Value Measurements using:
 
Carrying Amount
 
Fair Value
 
Quoted Prices  in Active Markets
for Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Energy commodity derivatives contracts
 
$
(26,085
)
 
$
(26,085
)
 
$
(26,085
)
 
$
—

 
$
—

Interest rate contracts
 
$
12,177

 
$
12,177

 
$
—

 
$
12,177

 
$
—

Long-term receivables
 
$
27,676

 
$
27,676

 
$
—

 
$
—

 
$
27,676

Debt
 
$
(4,524,492
)
 
$
(4,826,480
)
 
$
—

 
$
(4,826,480
)
 
$
—


 
 
June 30, 2018
Assets (Liabilities)
 
 
 
 
 
Fair Value Measurements using:
 
Carrying Amount
 
Fair Value
 
Quoted Prices in Active Markets
for Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Energy commodity derivatives contracts
 
$
(27,368
)
 
$
(27,368
)
 
$
(27,368
)
 
$
—

 
$
—

Interest rate contracts
 
$
19,288

 
$
19,288

 
$
—

 
$
19,288

 
$
—

Long-term receivables
 
$
23,875

 
$
23,875

 
$
—

 
$
—

 
$
23,875

Debt
 
$
(4,642,073
)
 
$
(4,706,966
)
 
$
—

 
$
(4,706,966
)
 
$
—