ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Cash equivalents
Cash equivalents		$ 45,100	$ 28,100
Assets:
Cash equivalents - Money market mutual funds		45,149	28,102
Trading securities held in a "rabbi trust"	[1]	55	68
Total assets		45,204	28,170
Liabilities:
Derivatives	[2]	4,256	2,356
Deferred compensation accrual "rabbi trust"	[3]	57	70
Total liabilities		4,313	2,426
Level 1
Assets:
Cash equivalents - Money market mutual funds		45,149	28,102
Trading securities held in a "rabbi trust"	[1]	55	68
Total assets		45,204	28,170
Liabilities:
Derivatives	[2]	0	0
Deferred compensation accrual "rabbi trust"	[3]	57	70
Total liabilities		57	70
Level 2
Assets:
Cash equivalents - Money market mutual funds		0	0
Trading securities held in a "rabbi trust"	[1]	0	0
Total assets		0	0
Liabilities:
Derivatives	[2]	4,256	2,356
Deferred compensation accrual "rabbi trust"	[3]	0	0
Total liabilities		4,256	2,356
Level 3
Assets:
Cash equivalents - Money market mutual funds		0	0
Trading securities held in a "rabbi trust"	[1]	0	0
Total assets		0	0
Liabilities:
Derivatives	[2]	0	0
Deferred compensation accrual "rabbi trust"	[3]	0	0
Total liabilities		$ 0	$ 0

[1] Trading securities held in a rabbi trust are included in Prepaids and other current assets and Other long-term assets, net in the consolidated balance sheets.

[2] Derivative financial instruments are included in Other current liabilities, net and Other long-term liabilities in the consolidated balance sheets.

[3] Non qualified deferred compensation in a rabbi trust is included in Accrued liabilities and Other long-term liabilities in the consolidated balance sheets.