Exhibit 12.1

	Year Ended December 31,
	2012		2011		2010		2009		2008
Computation of ratio of net income to fixed charges
Fixed charges (1)	$	197,064	$	144,662	$	95,923	$	96,267	$	104,481
Fixed charges (1)	$	197,064	$	144,662	$	95,923	$	96,267	$	104,481
Net income		349,245		284,373		169,500		174,400		79,129
	$	546,309	$	429,035	$	265,423	$	270,667	$	183,610
Ratio of earnings to combined fixed charges		2.77		2.97		2.77		2.81		1.76
Computation of ratio of net income to combined fixed charges and preferred stock dividends:
Fixed charges (1)	$	197,064	$	144,662	$	95,923	$	96,267	$	104,481
Preferred stock dividends (2)		7,551		—		—		—		—
Combined fixed charges and preferred stock dividends	$	204,615	$	144,662	$	95,923	$	96,267	$	104,481
Combined fixed charges and preferred stock dividends	$	204,615	$	144,662	$	95,923	$	96,267	$	104,481
Net income		349,245		284,373		169,500		174,400		79,129
	$	553,860	$	429,035	$	265,423	$	270,667	$	183,610
Ratio of earnings to combined fixed charges and preferred stock dividends		2.71		2.97		2.77		2.81		1.76

(1) Fixed charges consist of interest expense on all indebtedness.

(2) No preferred stock was outstanding during 2011, 2010, 2009, and 2008.