Exhibit 12.1

COMPUTATION OF RATIOS OF EARNINGS TO FIXED CHARGES

The following table sets forth our ratios of earnings to fixed charges for the periods presented (amounts in thousands).

	Nine months ended		Year ended December 31,
	September 30, 2016		2011		2012		2013		2014		2015
Earnings:
Earnings before income taxes	$	177,435	$	242,671	$	805,312	$	238,876	$	21,117	$	187,942
add:
Fixed Charges		137,171		88,278		122,535		117,704		138,623		138,540
Adjusted Earnings	$	314,606	$	330,949	$	927,847	$	356,580	$	159,740	$	326,482
Fixed Charges:
Interest Expense (includes capitalized interest)		105,455		88,484		105,710		93,605		105,816		92,258
Amortization of debt discount and expense		5,769		3,174		9,806		6,479		7,828		8,273
Estimate of interest within rental expense		31,288		9,647		13,716		23,292		32,496		41,538
Fixed Charges	$	142,512	$	101,305	$	129,232	$	123,376	$	146,140	$	142,069
Ratio of Earnings to Fixed Charges (a)		2.2x		3.3x		7.2x		2.9x		1.1x		2.3x
Coverage deficiency (b)		—		—		—		—		—

(a) For purposes of determining the ratio of earnings to fixed charges, earnings consist of income from continuing operations before income taxes and fixed charges (excluding interest capitalized during the period). Fixed charges consist of interest expense (including interest capitalized during the period), amortization of debt discount and deferred financing costs and the portion of rental expense that is representative of the interest factor in these rentals.

(b) The earnings for all periods presented were adequate to cover fixed charges.