			Year Ended December 31,

	Three Months Ended March 31, 2014		Year Ended December 31,
	Three Months Ended March 31, 2014		2013		2012		2011			2010
Earnings(1):
Income before income taxes	$	18,575	$	35,556	$	17,276	$	(584	)	$	(16,746	)
Add:
Fixed charges before capitalized interest		2,332		12,836		11,363		3,502			4,974
Amortization of capitalized interest		81		323		247		252			248
Total adjusted earnings	$	20,988	$	48,715	$	28,886	$	3,170		$	(11,524	)
Fixed charges(1):
Interest expensed	$	1,584	$	10,833	$	11,055	$	3,371		$	4,871
Interest capitalized		—		—		1,034		224			—
Estimate of interest in rental expense		748		2,003		308		131			103
Total fixed charges	$	2,332	$	12,836	$	12,397	$	3,726		$	4,974
Ratio of Earnings to Fixed Charges		9.0		3.8		2.3		—			—	(2)

(1): For purposes of this presentation, earnings represent income before income taxes adjusted for fixed charges and capitalized interest. Fixed charges consist of interest expensed and capitalized and an estimate of interest in rental expense.
(2): The ratio of earnings to fixed charges was less than 1:1 for the years ended December 31, 2011 and 2010. In order to achieve a ratio of earnings to fixed charges of 1:1, we would have had to generate an additional $0.9 million and $17.0 million of earnings for the years ended December 31, 2011 and 2010, respectively.