Consolidated Statements of (Loss) Income and Comprehensive (Loss) Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Income from discontinued operations, income tax expense	$ 0	$ 5,966	$ 0	$ 21,231
Foreign currency translation adjustment, income tax benefit	732	0	1,074	0
New Zealand joint venture cash flow hedges, income tax benefit (expense)	1,133	401	1,501	(100)
Amortization of pension and postretirement plans, income tax expense	$ 179	$ 35,944	$ 337	$ 36,875