Exhibit 12.1

Calculation of Ratios of Earnings to Fixed Charges

	Year Ended December 31,															Three Months Ended March 31, 2014
	2009			2010			2011			2012			2013
Earnings:
Pre-tax income	$	153,975		$	196,019		$	104,135	(1)	$	267,165	(2)	$	236,236	(3)	$	52,439
Plus: Distributions of earnings from unconsolidated investments		—			—			—			—			24,113			11,645
Plus: Fixed charges		40,123			41,677			49,180			53,972			64,936			19,860
Less: Non-controlling interest		—			—			(998	)		—			—			—
Less: Capitalized interest		(15	)		(42	)		—			—			—			—
Less: Equity and other unconsolidated investments income		—			—			—			—			(34,186	)		(9,779	)
Total earnings	$	194,083		$	237,696		$	152,317		$	321,137		$	290,559		$	74,165
Fixed Charges:
Interest expense	$	40,108		$	41,635		$	49,180		$	53,972		$	64,396		$	19,860
Plus: Capitalized interest		15			42			42			—			—			—
Total fixed charges	$	40,123		$	41,677		$	49,180		$	53,972		$	64,396		$	19,860
Ratio of earnings to fixed charges		4.84x			5.70x			3.10x	(1)		5.95x	(2)		4.51x	(3)		3.73x

(1) Includes asset impairment charges of $161.3 million. Excluding these charges, the ratio for 2011 would have been 6.40x.

(2) Includes asset impairment charges of $2.5 million. Excluding these charges, the ratio for 2012 would have been 6.00x.

(3) Includes asset impairment charges of $0.7 million. Excluding these charges, the ratio for 2013 would have been 4.52x.