Consolidated Statements of Income and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
SALES	$ 393,719	$ 336,571
Costs and Expenses
Cost of sales	266,018	235,708
Selling and general expenses	16,099	19,265
Other operating income, net	(3,503)	(1,139)
Costs and Expenses, Total	278,614	253,834
Equity in income of New Zealand joint venture	258	13
OPERATING INCOME	115,363	82,750
Interest expense	(7,717)	(11,825)
Interest and miscellaneous income (expense), net	57	(23)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	107,703	70,902
Income tax expense	(4,445)	(18,303)
INCOME FROM CONTINUING OPERATIONS	103,258	52,599
DISCONTINUED OPERATIONS, NET (Note 2)
Income from discontinued operations, net of income tax expense of $22,273 and $422	44,477	838
NET INCOME	147,735	53,437	278,685
OTHER COMPREHENSIVE INCOME
Foreign currency translation adjustment	975	5,825	4,352
New Zealand joint venture cash flow hedges	554	1,205	213
Gain from pension and postretirement plans, net of income tax expense of $2,204 and $1,368	4,969	3,140	(496)
Total other comprehensive income	6,498	10,170
COMPREHENSIVE INCOME	$ 154,233	$ 63,607
BASIC EARNINGS PER SHARE
Continuing Operations	$ 0.83	$ 0.43
Discontinued Operations	$ 0.36	$ 0.01
Net Income	$ 1.19	$ 0.44
DILUTED EARNINGS PER SHARE
Continuing Operations	$ 0.79	$ 0.41
Discontinued Operations	$ 0.34	$ 0.01
Net Income	$ 1.13	$ 0.42
Dividends per share	$ 0.44	$ 0.40	$ 1.68