Exhibit 12.1

Computation of Ratios of Earnings to Fixed Charges and Preferred Stock Dividends

(in thousands)

	Quarter Ended March 31,			Year Ended December 31,
	2017			2016			2015			2014			2013			2012
Ratio of Earnings to Fixed Charges
Earnings
Income (loss) before provision for income taxes	$	(13,485	)	$	545		$	(28,907	)	$	41,139		$	(1,162	)	$	(43,355	)
Plus:
Fixed charges		3,343			25,813			14,061			9,810			15,895			13,396
Amortization of capitalized interest		73			297			216			160			160			160
Equity earnings in unconsolidated subsidiaries		–			–			–			–			–			–
Less:
Capitalized interest		(176	)		(1,307	)		–			–			–			–
Income (loss) before income taxes and fixed charges	$	(10,245	)	$	25,348		$	(14,630	)	$	51,109		$	14,893		$	(29,799	)
Fixed charges
Interest expense, net, including amortization of deferred financing fees	$	2,637		$	22,406		$	12,594		$	9,438		$	15,671		$	13,049
Capitalized interest		176			1,307			–			–			–			–
Estimate of interest component in rent expense		530			2,100			1,467			372			224			347
Total fixed charges	$	3,343		$	25,813		$	14,061		$	9,810		$	15,895		$	13,396
Ratio of Earnings to fixed charges		(3.1	)		1.0			(1.0	)		5.2			0.9			(2.2	)
Excess (deficiency)	$	(13,588	)	$	(465	)	$	(28,691	)	$	41,299		$	(1,002	)	$	(43,195	)
	2017			2016			2015			2014			2013			2012
Ratio of Earnings to Fixed Charges and Preferred Stock Dividends
Earnings
Income (loss) before provision for income taxes	$	(13,485	)	$	545		$	(28,907	)	$	41,139		$	(1,162	)	$	(43,355	)
Plus:
Fixed charges and preferred dividends		3,823			27,765			16,007			11,756			17,160			14,664
Amortization of capitalized interest		73			297			216			160			160			160
Equity earnings in unconsolidated subsidiaries		–			–			–			–			–			–
Less:
Capitalized interest		176			(1,307	)		–			–			–			–
Preferred dividends		(480	)		(1,952	)		(1,946	)		(1,946	)		(1,265	)		(1,268	)
Income (loss) before income taxes and fixed charges	$	(9,893	)	$	25,348		$	(14,630	)	$	51,109		$	14,893		$	(29,799	)
Fixed charges and preferred dividends
Interest expense, net, including amortization of deferred financing fees	$	2,637		$	22,406		$	12,594		$	9,438		$	15,671		$	13,049
Capitalized interest		176			1,307			–			–			–			–
Estimate of interest component in rent expense		530			2,100			1,467			372			224			347
Preferred dividends		480			1,952			1,946			1,946			1,265			1,268
Total fixed charges and preferred stock dividends	$	3,823		$	27,765		$	16,007		$	11,756		$	17,160		$	14,664
Ratio of earnings to fixed charges and preferred stock dividends		(2.6	)		0.9			(0.9	)		4.3			0.9			(2.0	)
Excess (deficiency)	$	(13,716	)	$	(2,417	)	$	(30,637	)	$	39,353		$	(2,267	)	$	(44,463	)