Quarterly Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Data

Table 20.1: Quarterly Income Statement and Other Operating Data - 2017
	2017 Quarter Ended
	December 31			September 30			June 30			March 31
	(in thousands, except earnings per share and operating data)
Net sales	$	131,392		$	116,526		$	120,630		$	120,615
Costs, expenses and other income:
Cost of goods sold	94,432			87,952			89,817			89,624
Selling and administrative	10,389			8,867			9,193			9,304
Total costs and operating expenses	$	104,821		$	96,819		$	99,010		$	98,928
Operating income	26,571			19,707			21,620			21,687
Other (expense)/income, net	(563		)	146			(135		)	(644		)
Interest expense, net	(2,822		)	(2,988		)	(3,062		)	(2,916		)
Income before (losses)/income from equity method investment and benefit from/(provision for) income taxes	$	23,186		$	16,865		$	18,423		$	18,127
(Losses)/income from equity method investment	(158		)	(204		)	345			(170		)
Income before benefit from/(provision for) for income taxes	23,028			16,661			18,768			17,957
Benefit from/(provision for) income taxes	1,208			(5,674		)	(6,370		)	(5,730		)
Net income	$	24,236		$	10,987		$	12,398		$	12,227
Net income per share (1):
Basic	$	0.64		$	0.29		$	0.32		$	0.31
Diluted	$	0.64		$	0.29		$	0.32		$	0.31
Other operating data:
Wallboard sales volume (mmsf)	725			644			647			650
Mill net sales price	144.78			144.90			150.32			147.92
Depreciation and amortization	10,643			12,057			12,474			11,286

(1) As a result of rounding and the required method of computing shares in interim periods, the total of the quarterly earnings per share amounts may not equal the earnings per share amount of the year.

Table 20.2: Quarterly Income Statement and Other Operating Data - 2016
	2016 Quarter Ended
	December 31			September 30			June 30			March 31
	(in thousands, except earnings per share and operating data)
Net sales	$	118,217		$	114,558		$	117,115		$	111,485
Costs, expenses and other income:
Cost of goods sold	85,862			86,756			83,744			79,955
Selling and administrative	9,554			9,241			10,163			8,960
Total costs and operating expenses	$	95,416		$	95,997		$	93,907		$	88,915
Operating income	22,801			18,561			23,208			22,570
Other (expense)/income, net	(223		)	(5,900		)	6			154
Interest expense, net	(3,098		)	(3,146		)	(3,648		)	(3,698		)
Income before losses from equity method investment and provision for income tax	$	19,480		$	9,515		$	19,566		$	19,026
Losses from equity method investment	(10		)	(291		)	(240		)	(195		)
Income before provision for income taxes	$	19,470		$	9,224		$	19,326		$	18,831
Provision for income taxes	(6,879		)	(3,014		)	(6,604		)	(6,330		)
Net income	$	12,591		$	6,210		$	12,722		$	12,501
Net income per share (1):
Basic	$	0.32		$	0.15		$	0.31		$	0.30
Diluted	$	0.31		$	0.15		$	0.31		$	0.30
Other operating data:
Wallboard sales volume (mmsf)	666			634			643			617
Mill net sales price	141.61			144.34			144.86			144.62
Depreciation and amortization	10,990			11,868			11,842			11,946

(1) As a result of rounding and the required method of computing shares in interim periods, the total of the quarterly earnings per share amounts may not equal the earnings per share amount of the year.