CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (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]
Change in pension and postretirement benefit plans, tax	$ 2,441	$ 4,883	$ 2,154	$ 4,322
Change in unrealized gain on hedges, tax	$ 0	$ 0	$ 0	$ 1,034