Exhibit 12.1

	For the Six Months Ended
	June 30,						Year Ended December 31,
	2012			2011			2011			2010			2009			2008			2007
	(dollars in thousands)
Fixed Charges:
Interest expense	$	139,673	(a)	$	122,576	(a)	$	243,818	(b)	$	239,343	(b)	$	186,137	(b)	$	138,282	(b)	$	117,185
Interest component of rent		267			199			510			872			1,052			800			767
Capitalized interest		6,607			784			3,052			1,265			—			365			1,987
Total	$	146,547		$	123,559		$	247,380		$	241,480		$	187,189		$	139,447		$	119,939
Earnings:
Pretax (loss) income from continuing operations (c)	$	500,941		$	(99,295	)	$	102,139		$	(256,115	)	$	(1,785,326	)	$	(1,481,006	)	$	75,373
Fixed charges		146,547			123,559			247,380			241,480			187,189			139,447			119,939
Less: interest capitalized in current period		(6,607	)		(784	)		(3,052	)		(1,265	)		—			(365	)		(1,987	)
Add: previously capitalized interest amortized in current period		409			159			377			246			222			481			197
Total	$	641,290		$	23,639		$	346,844		$	(15,654	)	$	(1,597,915	)	$	(1,341,443	)	$	193,522
Ratio of Earnings to Fixed Charges		4.4			—			1.4			—			—			—			1.6
Insufficient coverage	$	—		$	99,920		$	—		$	257,134		$	1,785,104		$	1,480,890		$	—

(a) Interest expense for the six month periods ended June 30, 2012 and 2011 exclude the effects of ($3.6) million and ($1.4) million in unrealized (gains), respectively, on interest rate swaps.

(b) Interest expense for the year ended December 31, 2011, 2010, 2009 and 2008 excludes the effect of ($6.2) million, $8.4 million, $(0.4) million and $8.7 million unrealized (gain) loss, respectively, on interest rate swaps.

(c) Excludes undistributed income from equity investees.