FAIR VALUE OF ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Investments measured at fair value on a recurring basis
Maximum percentage of assets measured using Level 3 valuation methodologies to total assets	1.00%
Recurring basis
Investments measured at fair value on a recurring basis
Money market funds	$ 1,255	$ 1,245
Total	8,628	10,334
Recurring basis | Corporate debt securities and other obligations
Investments measured at fair value on a recurring basis
Short-term investments		2,181
Recurring basis | Auction-rate securities
Investments measured at fair value on a recurring basis
Other Assets, Fair Value Disclosure	1,066	1,066
Recurring basis | Institutional money market funds
Investments measured at fair value on a recurring basis
Other Assets, Fair Value Disclosure	2,053	2,225
Recurring basis | Fixed income
Investments measured at fair value on a recurring basis
Other Assets, Fair Value Disclosure	847	338
Recurring basis | Marketable equity securities
Investments measured at fair value on a recurring basis
Other Assets, Fair Value Disclosure	3,407	3,279
Recurring basis | Total institutional funds - Deferred compensation plan
Investments measured at fair value on a recurring basis
Other Assets, Fair Value Disclosure	6,307	5,842
Recurring basis | Total other assets [Domain]
Investments measured at fair value on a recurring basis
Other Assets, Fair Value Disclosure	7,373	6,908
Recurring basis | Level 1
Investments measured at fair value on a recurring basis
Money market funds	1,255	1,245
Total	7,562	9,268
Recurring basis | Level 1 | Corporate debt securities and other obligations
Investments measured at fair value on a recurring basis
Short-term investments		2,181
Recurring basis | Level 1 | Institutional money market funds
Investments measured at fair value on a recurring basis
Other Assets, Fair Value Disclosure	2,053	2,225
Recurring basis | Level 1 | Fixed income
Investments measured at fair value on a recurring basis
Other Assets, Fair Value Disclosure	847	338
Recurring basis | Level 1 | Marketable equity securities
Investments measured at fair value on a recurring basis
Other Assets, Fair Value Disclosure	3,407	3,279
Recurring basis | Level 1 | Total institutional funds - Deferred compensation plan
Investments measured at fair value on a recurring basis
Other Assets, Fair Value Disclosure	6,307	5,842
Recurring basis | Level 1 | Total other assets [Domain]
Investments measured at fair value on a recurring basis
Other Assets, Fair Value Disclosure	6,307	5,842
Recurring basis | Level 3
Investments measured at fair value on a recurring basis
Other Assets, Fair Value Disclosure		1,066
Total	1,066	1,066
Recurring basis | Level 3 | Auction-rate securities
Investments measured at fair value on a recurring basis
Other Assets, Fair Value Disclosure	$ 1,066	$ 1,066