FAIR VALUE OF ASSETS AND LIABILITIES (Details) (USD $)		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012 Auction-rate securities	Dec. 31, 2013 Recurring basis	Dec. 31, 2012 Recurring basis	Dec. 31, 2013 Recurring basis Corporate debt securities and other obligations	Dec. 31, 2012 Recurring basis Corporate debt securities and other obligations	Dec. 31, 2013 Recurring basis Auction-rate securities	Dec. 31, 2012 Recurring basis Auction-rate securities	Dec. 31, 2013 Recurring basis Institutional money market funds	Dec. 31, 2012 Recurring basis Institutional money market funds	Dec. 31, 2013 Recurring basis Fixed income	Dec. 31, 2012 Recurring basis Fixed income	Dec. 31, 2013 Recurring basis Marketable equity securities	Dec. 31, 2012 Recurring basis Marketable equity securities	Dec. 31, 2013 Recurring basis Total institutional funds - Deferred compensation plan	Dec. 31, 2012 Recurring basis Total institutional funds - Deferred compensation plan	Dec. 31, 2013 Recurring basis Total other assets [Domain]	Dec. 31, 2012 Recurring basis Total other assets [Domain]	Dec. 31, 2013 Recurring basis Level 1	Dec. 31, 2012 Recurring basis Level 1	Dec. 31, 2013 Recurring basis Level 1 Corporate debt securities and other obligations	Dec. 31, 2012 Recurring basis Level 1 Corporate debt securities and other obligations	Dec. 31, 2013 Recurring basis Level 1 Auction-rate securities	Dec. 31, 2013 Recurring basis Level 1 Institutional money market funds	Dec. 31, 2012 Recurring basis Level 1 Institutional money market funds	Dec. 31, 2013 Recurring basis Level 1 Fixed income	Dec. 31, 2012 Recurring basis Level 1 Fixed income	Dec. 31, 2013 Recurring basis Level 1 Marketable equity securities	Dec. 31, 2012 Recurring basis Level 1 Marketable equity securities	Dec. 31, 2013 Recurring basis Level 1 Total institutional funds - Deferred compensation plan	Dec. 31, 2012 Recurring basis Level 1 Total institutional funds - Deferred compensation plan	Dec. 31, 2013 Recurring basis Level 1 Total other assets [Domain]	Dec. 31, 2012 Recurring basis Level 1 Total other assets [Domain]	Dec. 31, 2013 Recurring basis Level 2	Dec. 31, 2012 Recurring basis Level 2	Dec. 31, 2013 Recurring basis Level 2 Corporate debt securities and other obligations	Dec. 31, 2012 Recurring basis Level 2 Corporate debt securities and other obligations	Dec. 31, 2013 Recurring basis Level 2 Auction-rate securities	Dec. 31, 2013 Recurring basis Level 3	Dec. 31, 2012 Recurring basis Level 3	Dec. 31, 2013 Recurring basis Level 3 Corporate debt securities and other obligations	Dec. 31, 2013 Recurring basis Level 3 Auction-rate securities	Dec. 31, 2012 Recurring basis Level 3 Auction-rate securities
Investments measured at fair value on a recurring basis
Money market funds			$ 1,245,000	$ 1,036,000															$ 1,245,000	$ 1,036,000														$ 0					$ 0
Short-term investments					2,181,000	2,687,000															2,181,000	2,687,000														0	0				0
Other assets							1,066,000	1,066,000	2,225,000	597,000	338,000	902,000	3,279,000	3,479,000	5,842,000	4,978,000	6,908,000	6,044,000					0	2,225,000	597,000	338,000	902,000	3,279,000	3,479,000	5,842,000	4,978,000	5,842,000	4,978,000					0	1,066,000	1,066,000		1,066,000	1,066,000
Total			10,334,000	9,767,000															9,268,000	8,701,000														0	0				1,066,000	1,066,000
Proceeds from Sale of Available-for-sale Securities		$ 1,200,000
Maximum percentage of assets measured using Level 3 valuation methodologies to total assets	1.00%