EXHIBIT 12.1

Computation of Ratio of Earnings to Fixed Charges

(unaudited)

	Years Ended December 31,															Six Months Ended June 30,
	2009			2010			2011			2012			2013			2014
	(in thousands, except ratios)
Earnings
Profit before taxes	$	31,844		$	44,346		$	140,703		$	222,795		$	186,082		$	107,112
Fixed charges		23,902			22,979			23,198			21,738			24,703			18,141
Earnings	$	55,746		$	67,325		$	163,901		$	244,533		$	210,785		$	125,253
Fixed Charges
Interest expense	$	19,451		$	18,189		$	19,532		$	16,372		$	18,370		$	15,475
Estimated interest expense on rental items		3,066			3,866			3,666			5,366			6,333			2,666
Fixed charges	$	23,902		$	22,979		$	23,198		$	21,738		$	24,703		$	18,141
Preferred stock dividends	$	1,385		$	923			—			—			—			—
Ratio of Earnings to Fixed Charges		2.4	x		3.0	x		7.1	x		11.2	x		8.5	x		6.9	x
Ratio of Combined Fixed Charges and Preferred Stock Dividends to Earnings		2.3	x		2.9	x		7.1	x		11.2	x		8.5	x		6.9	x