Consolidated Statements of Income and Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Income from discontinued operations, income tax expense	$ 0	$ 18,313	$ 21,231	$ 82,223
New Zealand joint venture cash flow hedges, income tax benefit	1,170	0	1,270	0
Net gain from pension and postretirement plans, income tax expense	$ 150	$ 1,579	$ 37,025	$ 5,403