exh12b.htm

	6 Months Ended		12 Months Ended			12 Months Ended
	Jun. 30		Jun. 30			Dec. 31,			Dec. 31,			Dec. 31,			Dec. 31,			Dec. 31,
	2007		2007			2006			2005			2004			2003			2002
						- Thousands of Dollars -
Fixed Charges:
Interest on Long-Term Debt	$	25,115	$	51,517		$	51,422		$	56,243		$	69,904		$	76,585		$	65,620
Other Interest (1)		2,958		7,528			6,436			2,597			1,263			1,820			273
Interest on Capital Lease Obligations		32,266		67,758			72,556			79,064			85,869			84,053			87,783
Total Fixed Charges		60,339		126,803			130,414			137,904			157,036			162,458			153,676

Net Income		13,092		52,029			66,745			48,267			46,127			128,913			55,390

Less:
Cumulative Effect of Accounting Change -
Net of Tax		-		-			-			(626	)		-			67,471			-
Net Income from Continuing Operations		13,092		52,029			66,745			48,893			46,127			61,442			55,390

Add (Deduct):
(Income) Losses from Equity Investees (2)		-		(213	)		(320	)		(314	)		(131	)		(76	)		17
Income Taxes		9,435		32,486			42,478			33,907			34,815			21,090			36,434
Total Fixed Charges		60,339		126,803			130,414			137,904			157,036			162,458			153,676

Total Earnings before Taxes and Fixed Charges	$	82,866	$	211,105		$	239,317		$	220,390		$	237,847		$	244,914		$	245,517


Ratio of Earnings to Fixed Charges		1.373		1.665			1.835			1.598			1.515			1.508			1.598