ASSET RETIREMENT OBLIGATIONS (Tables)

12 Months Ended

Dec. 31, 2015

Asset Retirement Obligations

Change in the carrying amount of the asset retirement obligation

(in thousands)	2015		2014
Asset retirement obligation at January 1,	$	173,008	$	154,026
Liabilities incurred		4,114		13,015
Liability settlements and disposals		(25,061)		(27,036)
Accretion expense		7,682		7,583
Revisions of estimated liabilities		4,362		25,420
Asset retirement obligation at December 31,		164,105		173,008
Less current obligation		10,248		13,216
Long-term asset retirement obligation	$	153,857	$	159,792