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).

	Six Months Ended June 30, 2017			2012			2013			2014			2015			2016
Earnings:
Earnings before income taxes	$	(264,584	)	$	805,312		$	238,876		$	21,117		$	187,942		$	259,575
add:
Fixed Charges		89,567			122,535			117,704			138,623			138,540			182,365
Adjusted Earnings	$	(175,017	)	$	927,847		$	356,580		$	159,740		$	326,482		$	441,940
Fixed Charges:
Interest Expense (includes capitalized interest)		67,668			105,710			93,605			105,816			92,258			140,056
Amortization of debt discount and expense		4,418			9,806			6,479			7,828			8,273			7,873
Estimate of interest within rental expense		21,040			13,716			23,292			32,496			41,538			42,769
Fixed Charges	$	93,126		$	129,232		$	123,376		$	146,140		$	142,069		$	190,698
Ratio of Earnings to Fixed Charges (a)		(b	)		7.2	x		2.9	x		1.1	x		2.3	x		2.3	x
Coverage deficiency (b)	$	(268,143	)		—			—			—			—			—

(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) Earnings for the six months ended June 30, 2017 were inadequate to cover fixed charges by $268,143.