Exhibit 12.1

RATIO OF EARNINGS TO FIXED CHARGES

	Year Ended December 31,															Three Months Ended
	2010			2011			2012			2013			2014			March 31, 2015
	(in thousands, except ratio)
Pre-tax income from continuing operations before adjustment for noncontrolling interests in consolidated subsidiaries or income or loss from equity investees	$	(50,074	)	$	46,807		$	73,787		$	62,174		$	65,912		$	5,604
Capitalized interest		(84	)		(106	)		(3,891	)		(13,324	)		(13,785	)		(3,023	)
Depreciation of capitalized interest		36			43			302			1,190			2,109			578
Distributions from 50% or less owned companies carried at equity		6,482			20,028			38,809			46,564			75,528			258,902
Adjusted pre-tax income from continuing operations before adjustment for noncontrolling interests in consolidated subsidiaries or income or loss from equity investees	$	(43,640	)	$	66,772		$	109,007		$	96,604		$	129,764		$	29,061
Fixed charges
Interest on long-term debt	$	22,992		$	35,771		$	40,923		$	48,583		$	66,639		$	19,250
Capitalized interest		84			106			3,891			13,324			13,785			3,023
Rental expenses representative of an interest factor		3,904			4,570			5,383			6,919			9,485			2,175
Total fixed charges	$	26,980		$	40,447		$	50,197		$	68,826		$	89,909		$	24,448
Adjusted pre-tax income from continuing operations before adjustment for noncontrolling interests in consolidated subsidiaries or income or loss from equity investees plus total fixed charges	$	(16,660	)	$	107,219		$	159,204		$	165,430		$	219,673		$	53,509
RATIO OF EARNINGS TO FIXED CHARGES		—			2.7			3.2			2.4			2.4			2.2