FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details 3) (Recurring basis, Level 1, USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financial Assets Measured at Fair Value
Financial Assets at Fair Value	$ 37,417	$ 15,164
Money market funds
Financial Assets Measured at Fair Value
Financial Assets at Fair Value	34,602	12,101
Voluntary Savings Plan - mutual funds held in trust
Financial Assets Measured at Fair Value
Financial Assets at Fair Value	$ 2,815	$ 3,063