Consolidated Statements of Income and Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Income from discontinued operations, income tax expense	$ 0	$ 15,308
Foreign currency translation adjustment, income tax benefit	343	0
New Zealand joint venture cash flow hedges, income tax benefit (expense)	436	(501)
Amortization of pension and postretirement plans, income tax expense	$ 158	$ 931