Commitments and Contingencies (Tables)

3 Months Ended

Dec. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Summary of Asset Retirement Obligations Activity

The following table summarizes asset retirement obligations activity.

Asset retirement obligations:	As of December 31,
(in thousands)	2014
Balance at beginning of period	$	5,263
Asset retirement obligations reclassified to liabilities of discontinued operations	(720		)
Subtotal	4,543
Accretion expense	16
Revision in estimated cash flows	(2,879		)
Balance at end of period	$	1,680