Consolidated Statements of Income and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
SALES	$ 1,488,642		$ 1,315,233		$ 1,168,567
Costs and Expenses
Cost of sales	1,073,732		990,099		914,772
Selling and general expenses	66,541		67,102		62,633
Other operating income, net (Note 14)	(3,829)		(10,519)		(221,172)
Costs and Expenses, Total	1,136,444		1,046,682		756,233
Equity in income (loss) of New Zealand joint venture	4,088		1,033		(2,826)
OPERATING INCOME BEFORE GAIN ON SALE OF A PORTION OF INTEREST IN NEW ZEALAND JOINT VENTURE	356,286		269,584		409,508
Gain on sale of a portion of interest in New Zealand joint venture (Note 5)	0		12,367		0
OPERATING INCOME	356,286		281,951		409,508
Interest expense	(50,775)		(50,463)		(52,441)
Interest and miscellaneous income, net	851		1,315		1,810
INCOME BEFORE INCOME TAXES	306,362		232,803		358,877
Income tax expense	(30,357)		(15,217)		(46,336)
NET INCOME	276,005		217,586		312,541
OTHER COMPREHENSIVE INCOME (LOSS)
Foreign currency translation adjustment	3,546		4,162		15,980
New Zealand joint venture cash flow hedges	(2,373)		837		(2,305)
(Loss) gain from pension and postretirement plans, net of income benefit (expense) of $20,665, $1,570, and $(1,401)	(46,263)		6,385		4,879
COMPREHENSIVE INCOME	$ 230,915		$ 228,970		$ 331,095
EARNINGS PER COMMON SHARE
Basic earnings per share	$ 2.27	[1]	$ 1.81	[1]	$ 2.63
Diluted earnings per share	$ 2.20	[1]	$ 1.79	[1]	$ 2.60
Dividends per share	$ 1.52		$ 1.36		$ 1.33

[1] The impact of the August 2011 three-for-two stock split is reflected for all periods presented. See Note 9 — Earnings per Common Share for further information.