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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (FV) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Interest rate swap agreement | Other long-term liabilities
Assets and liabilities measured at fair value on a recurring basis
Liabilities	$ 2,000	$ 900
Recurring basis
Assets and liabilities measured at fair value on a recurring basis
Assets	41,725	27,031
Recurring basis | Interest rate swap agreement | Other long-term liabilities
Assets and liabilities measured at fair value on a recurring basis
Liabilities	2,035	897
Recurring basis | Money market funds | Cash and cash equivalents
Assets and liabilities measured at fair value on a recurring basis
Assets	39,805	24,904
Recurring basis | Voluntary Savings Plan - mutual funds held in trust | Other long-term assets
Assets and liabilities measured at fair value on a recurring basis
Assets	1,920	2,127
Recurring basis | Level 1
Assets and liabilities measured at fair value on a recurring basis
Assets	41,725	27,031
Recurring basis | Level 1 | Money market funds | Cash and cash equivalents
Assets and liabilities measured at fair value on a recurring basis
Assets	39,805	24,904
Recurring basis | Level 1 | Voluntary Savings Plan - mutual funds held in trust | Other long-term assets
Assets and liabilities measured at fair value on a recurring basis
Assets	1,920	2,127
Recurring basis | Level 2 | Interest rate swap agreement | Other long-term liabilities
Assets and liabilities measured at fair value on a recurring basis
Liabilities	$ 2,035	$ 897

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
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