Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2013

Schedule of Changes in Asset Retirement Obligations

The following shows the changes in the asset retirement obligations:

     years ended December 31:

(add 000)	2013			2012
Balance at beginning of year	$	46,173		$	43,233
Accretion expense		2,777			2,712
Liabilities incurred		2,240			204
Liabilities settled		--			(126	)
Revisions in estimated cash flows		(2,463	)		150
Balance at end of year	$	48,727		$	46,173

Schedule of Contractual Purchase Commitments

The Corporation’s contractual purchase commitments as of December 31, 2013 are as follows:

(add 000)
2014	$	46,594
2015		2,985
2016		2,756
2017		2,756
2018		2,690
Thereafter		13,663
Total	$	71,444