ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	$ 698,183
Balance at the end of the period	711,364	$ 698,183
AOCI from Derivatives
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(1,675)	(1,236)
Other comprehensive earnings (loss) before reclassifications	325	(2,041)
Reclassifications from accumulated other comprehensive loss	1,274	1,602
Other comprehensive earnings (loss) net of tax	1,599	(439)
Balance at the end of the period	(76)	(1,675)
Investments
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(605)	(332)
Other comprehensive earnings (loss) before reclassifications	(95)	(273)
Reclassifications from accumulated other comprehensive loss	3
Other comprehensive earnings (loss) net of tax	(92)	(273)
Balance at the end of the period	(697)	(605)
Postretirement and Pension Benefits
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	6,387	6,439
Other comprehensive earnings (loss) before reclassifications	(466)	874
Reclassifications from accumulated other comprehensive loss	(1,048)	(926)
Other comprehensive earnings (loss) net of tax	(1,514)	(52)
Balance at the end of the period	4,873	6,387
Foreign Currency Translation
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(21,644)	(17,499)
Other comprehensive earnings (loss) before reclassifications	(3,816)	(4,145)
Other comprehensive earnings (loss) net of tax	(3,816)	(4,145)
Balance at the end of the period	(25,460)	(21,644)
Commodity Derivatives
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	173	(470)
Other comprehensive earnings (loss) before reclassifications	1,481	(392)
Reclassifications from accumulated other comprehensive loss	(540)	1,035
Other comprehensive earnings (loss) net of tax	941	643
Balance at the end of the period	1,114	173
Accumulated Other Comprehensive Earnings ( Loss )
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(17,364)	(13,098)
Other comprehensive earnings (loss) before reclassifications	(2,571)	(5,977)
Reclassifications from accumulated other comprehensive loss	(311)	1,711
Other comprehensive earnings (loss) net of tax	(2,882)	(4,266)
Balance at the end of the period	$ (20,246)	$ (17,364)