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Fair Value Measurements (Tables)
 3 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of Financial Assets and Financial Liabilities that are Measured 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
$
678

 
$
19

 
$
—

 
$
697

Liabilities:
 
 
 
 
 
 
 
Commodity contracts
$
(2,151
)
 
$
(112
)
 
$
—

 
$
(2,263
)
September 30, 2017:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
1,735

 
$
72

 
$
—

 
$
1,807

Liabilities:
 
 
 
 
 
 
 
Commodity contracts
$
(1,447
)
 
$
(73
)
 
$
—

 
$
(1,520
)
December 31, 2016:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
7,077

 
$
—

 
$
—

 
$
7,077

Liabilities:
 
 
 
 
 
 
 
Commodity contracts
$
—

 
$
(295
)
 
$
—

 
$
(295
)
Schedule of 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
$
860,000

 
$
755,000

 
$
775,000

Estimated fair value
$
909,283

 
$
791,378

 
$
800,504