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Commitments and Contingencies (Tables)
 3 Months Ended
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Summary of Asset Retirement Obligations Activity
The following table summarizes asset retirement obligations activity:

Asset Retirement Obligations
December 31,
(in thousands)
2015
Balance at September 30, 2015
$
1,774

Accretion expense
15

Payments and revision in estimated cash flows
(264
)
Balance at December 31, 2015
$
1,525