CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues	$ 155,402	$ 201,477	$ 480,527	$ 502,879
Cost of sales	113,252	138,718	340,365	358,402
Gross profit	42,150	62,759	140,162	144,477
Selling, general and administrative expenses	18,087	18,578	53,960	51,069
Start-up costs			811
Loss (gain) on disposal or impairment of assets	5,055	(16)	4,864	(56)
Operating profit	19,008	44,197	80,527	93,464
Other income, net	48	202	342	527
Income before income taxes	19,056	44,399	80,869	93,991
Income taxes	5,312	14,251	25,680	29,960
Net income	$ 13,744	$ 30,148	$ 55,189	$ 64,031
Earnings per share:
Basic	$ 0.60	$ 1.31	$ 2.39	$ 2.77
Diluted	$ 0.60	$ 1.31	$ 2.39	$ 2.77
Other information:
Dividends declared per common share (See Note 4)	$ 0.66	$ 0.60	$ 1.26	$ 1.14