ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands		Mar. 31, 2016		Dec. 31, 2015
Cash equivalents
Cash equivalents		$ 28,100		$ 28,100
Assets:
Cash equivalents - Money market mutual funds		28,112		28,102
Trading securities held in a "rabbi trust"	[1]	44		68
Total assets		28,156		28,170
Liabilities:
Derivatives	[2]	3,928		2,356
Deferred compensation accrual "rabbi trust"	[3]	46		70
Total liabilities		3,974		2,426
Level 1
Assets:
Cash equivalents - Money market mutual funds		28,112		28,102
Trading securities held in a "rabbi trust"	[1]	44		68
Total assets		28,156		28,170
Liabilities:
Derivatives	[2]	0		0
Deferred compensation accrual "rabbi trust"	[3]	46		70
Total liabilities		46		70
Level 2
Assets:
Cash equivalents - Money market mutual funds		0		0
Trading securities held in a "rabbi trust"		0	[1]	0
Total assets		0		0
Liabilities:
Derivatives	[2]	3,928		2,356
Deferred compensation accrual "rabbi trust"	[3]	0		0
Total liabilities		3,928		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 Other current and Other long-term assets in the consolidated balance sheets.

[2] Derivative financial instruments are included in Other current 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.