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Fair Value Measurements (Tables)
 3 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Financial Assets and Financial Liabilities at Fair Value on a Recurring Basis
The following table presents on a gross basis our derivative assets and liabilities, including both current and noncurrent portions, that are measured at fair value on a recurring basis within the fair value hierarchy, as of December 31, 2017, September 30, 2017 and December 31, 2016: 
 
 
Asset (Liability)
 
 
Level 1
 
Level 2
 
Level 3
 
Total
December 31, 2017:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
—

 
$
41,187

 
$
—

 
$
41,187

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
—

 
$
(633
)
 
$
—

 
$
(633
)
September 30, 2017:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
—

 
$
40,714

 
$
—

 
$
40,714

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
—

 
$
(920
)
 
$
—

 
$
(920
)
December 31, 2016:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
—

 
$
34,625

 
$
—

 
$
34,625

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
—

 
$
(151
)
 
$
—

 
$
(151
)
Carrying Amount and Estimated Fair Value of Long-term Debt
The carrying amount and estimated fair value of our long-term debt (including current maturities but excluding unamortized debt issuance costs) at December 31, 2017, September 30, 2017 and December 31, 2016 were as follows:

 
December 31, 2017
 
September 30, 2017
 
December 31, 2016
Carrying amount
$
2,602,304

 
$
2,603,610

 
$
2,558,707

Estimated fair value
$
2,660,194

 
$
2,699,428

 
$
2,619,790