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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Comprehensive income (loss):
Net income (loss)	$ 7,131	$ (9,515)	$ (8,008)	$ (25,678)
Other comprehensive income (loss) before income tax effect:
Net loss on foreign currency cash flow hedges reclassified as income	(48)	(47)	(94)	(93)
Defined benefit plans and other postretirement benefits:
Amortization of prior service benefit during the period	(671)	(667)	(982)	(1,334)
Amortization of net loss during the period	577	1,920	2,720	3,839
Other comprehensive income (loss) before income tax effect	(142)	1,206	1,644	2,412
Income tax effect	311	(382)	(763)	(765)
Other comprehensive income	169	824	881	1,647
Total comprehensive income (loss)	$ 7,300	$ (8,691)	$ (7,127)	$ (24,031)

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