ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands		Sep. 30, 2015		Dec. 31, 2014
Cash equivalents
Cash equivalents		$ 30,100		$ 135,100
Assets:
Cash equivalents - Money market mutual funds		30,100		135,092
Trading securities held in a "rabbi trust"	[1]	62		90
Total assets		30,162		135,182
Liabilities:
Derivatives	[2]	2,815		1,008
Deferred compensation accrual "rabbi trust"	[3]	65		94
Total liabilities		2,880		1,102
Level 1
Assets:
Cash equivalents - Money market mutual funds		30,100		135,092
Trading securities held in a "rabbi trust"	[1]	62		90
Total assets		30,162		135,182
Liabilities:
Derivatives	[2]	0		0
Deferred compensation accrual "rabbi trust"	[3]	65		94
Total liabilities		65		94
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]	2,815		1,008
Deferred compensation accrual "rabbi trust"	[3]	0		0
Total liabilities		2,815		1,008
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.