Exhibit 12

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

	Years Ended December 31,										Six Months Ended June 30,
	2012		2011		2010		2009		2008		2013		2012
	(In thousands, except ratios)
Earnings:
Income from continuing operations before income taxes	(1,164,759	)	494,823		577,596		183,994		332,789		(199,735	)	80,584
Plus: Fixed charges	152,463		108,594		22,723		23,808		32,627		109,643		65,881
Less: Interest capitalized during the period	(7,677	)	(5,474	)	(1,363	)	(1,196	)	(3,860	)	(1,181	)	(3,560	)
	(1,019,973	)	597,943		598,956		206,606		361,556		(91,273	)	142,905
Fixed Charges:
Interest expense	139,356		96,820		17,250		18,975		26,226		105,747		59,171
Plus: Interest capitalized during the period	7,677		5,474		1,363		1,196		3,860		1,181		3,560
Interest portion of rental expense	5,430		6,300		4,110		3,637		2,541		2,715		3,150
	152,463		108,594		22,723		23,808		32,627		109,643		65,881
Ratio of Earnings to Fixed Charges (1)	n/a		5.51		26.36		8.68		11.08		n/a		2.17

(1) For the year ended December 31, 2012, earnings were insufficient to cover fixed charges by approximately $1,172.4 million.  For the six months ended June 30, 2013, earnings were insufficient to cover fixed charges by approximately $200.9 million.