Exhibit 12.1

RATIO OF EARNINGS TO FIXED CHARGES

The following table contains our consolidated ratio of earnings to fixed charges for the periods indicated. You should read these ratios in connection with our consolidated financial statements, including the notes to those financial statements (amounts in table in thousands, except ratios).

	For the three months ended March 31,			For the years ended December 31,
	2014			2013			2012			2011			2010		2009
Income (loss) before income taxes	$	25,899		$	54,791		$	(34,691	)	$	(15,830	)	$	9,898	$	(24,350	)
Add:
Fixed charges (see below)		2,263			8,162			2,835			2,206			55		54
Amortization of capitalized interest		101			383			187			7			—		—
Less:
Interest capitalized		(670	)		(1,888	)		(1,574	)		(1,278	)		—		—
Total earnings	$	27,593		$	61,448		$	(33,243	)	$	(14,895	)	$	9,953	$	(24,296	)
Fixed charges
Interest expensed	$	1,396		$	5,687		$	1,002		$	683		$	3	$	—
Interest capitalized		670			1,888			1,574			1,278			—		—
Amortized premiums, discounts & capitalized expenses related to indebtedness		187			547			231			221			33		33
Estimate of interest within rental expense		10			40			28			24			19		21
Total fixed charges	$	2,263		$	8,162		$	2,835		$	2,206		$	55	$	54
Ratio of earnings to fixed charges		12.19			7.53			(a	)		(a	)		179.99		(a	)

(a) During the period noted, our coverage ratio was less than 1:1. We would have needed to generate additional earnings of approximately $36.1 million during the year ended December 31, 2012, $17.1 million during the year ended December 31, 2011, and $24.4 million during the year ended December 31, 2009, respectively, to achieve a coverage ratio of 1:1.