Exhibit 12.1

	Year Ended December 31,										Three months ended March 31,
	2013		2014		2015		2016		2017		2017		2018
Ratio of earnings to fixed charges:
Earnings:
Income from continuing operations	$	116,309	$	141,642	$	97,933	$	57,375	$	131,226	$	27,245	$	33,183
Add:
Fixed charges		77,125		174,437		192,823		205,133		211,252		51,200		59,138
Total earnings and fixed charges	$	193,434	$	316,079	$	290,756	$	262,508	$	342,478	$	78,445	$	92,321
Fixed Charges:
Interest expense and amortized debt discount and loan cost	$	73,269	$	166,942	$	186,556	$	198,367	$	204,161	$	49,198	$	57,462
Estimated interest portion of rental expense		3,856		7,495		6,267		6,766		7,091		2,002		1,676
Total fixed charges	$	77,125	$	174,437	$	192,823	$	205,133	$	211,252	$	51,200	$	59,138
Ratio of Earnings to Fixed Charges(1)		2.51		1.81		1.51		1.28		1.62		1.53		1.56

⁽¹⁾  The ratio of earnings to fixed charges are computed by dividing earnings by fixed charges. For these purposes, “earnings” consist of income from continuing operations before provision for income taxes plus fixed charges, and “fixed charges” consist of interest expense on all indebtedness, amortization of debt issuance costs, and that portion of rental expense deemed to be representative of interest.