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Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2017

Asset Retirement Obligation Disclosure [Abstract]

Schedule Of Changes In Asset Retirement Obligation

	2017				2016				2015
Asset retirement obligation at beginning of year	$	15,515			$	15,997			$	3,028
Liabilities incurred	1,171				430				12,539
Liabilities settled	—				(1,529		)		(29		)
Accretion expense	796				617				459
Asset retirement obligation at end of year	$	17,482			$	15,515			$	15,997

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- References

No definition available.

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- Definition

Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859

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