CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Unrealized gain (loss) on derivatives designated and qualifying as cash flow hedges, tax (benefit)	$ 390	$ 239	$ 415	$ (95)
Unrecognized amounts from defined benefit pension plans, tax benefit (expense)	$ 1,278	$ 2,170	$ 1,927	$ 2,532