CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Unrealized gain (loss) on derivatives designated and qualifying as cash flow hedges, tax (benefit)	$ (309)	$ 97	$ 25	$ (334)
Unrecognized amounts from defined benefit pension plans, tax benefit (expense)	$ 218	$ 149	$ 649	$ 362