Exhibit 12.1

RATIO OF EARNINGS TO FIXED CHARGES (unaudited)

			Year Ended December 31, (dollars in thousands)								Six Months Ended June 30,			Six Months Ended June 30,
	2011		2010		2009		2008(1)		2007		2012			2011
Earnings:
Income (loss) before income taxes	$	34,546	$	20,760	$	(6,169)	$	(210,870)	$	116,498	$	73,442		$	(15,224)
Fixed charges (excluding capitalized interest)	107,405		121,971		107,537		77,307		58,430		56,129			52,609
Amortization of capitalized interest	6,471		4,966		3,476		2,110		1,040		7,988			6,467
Total earnings	$	148,422	$	147,697	$	104,844	$	(131,453)	$	175,968	$		137,559	$	43,852
Fixed charges:
Interest expense (including amortization of debt discount and issuance costs), net of capitalized interest	$	106,623	$	121,233	$	106,849	$	76,639	$	57,742	$	55,706		$	52,219
Capitalized Interest	478		684		8,964		14,091		19,879		472			152
Estimated interest component of rent expense	782		738		688		668		688		423			390
Total fixed charges	$	107,883	$	122,655	$	116,501	$	91,398	$	78,309	$	56,601		$	52,761
Ratio of earnings to fixed charges	1.38x		1.20x		0.90x		-----		2.25x		2.43x			0.83x

(1) For the year ended December 31, 2008, earnings were insufficient to cover fixed charges by $40,055.