FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 4) (USD $)	12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Auction rate securities	Dec. 31, 2013 2011 ARS Agreement	Dec. 31, 2012 2011 ARS Agreement	Dec. 31, 2011 2011 ARS Agreement	Jun. 30, 2011 2011 ARS Agreement	Dec. 31, 2013 2011 ARS Agreement Subsequent event	Dec. 31, 2011 2010 ARS Agreement	Mar. 31, 2010 2010 ARS Agreement	Dec. 31, 2013 Put option related to auction rate securities	Dec. 31, 2013 2011 Put Option	Oct. 02, 2013 2011 Put Option Maximum	Jul. 02, 2013 2011 Put Option Maximum	Mar. 31, 2012 2010 Put Option
ARS Agreement
Face value of investments				$ 17,200,000
Amortized Cost	412,039,000	115,952,000		16,200,000
Trading auction rate securities, in short-term and long-term investments				16,200,000
Impairment of investments, trading securities				1,000,000
Amount of securities of par value								24,500,000			54,200,000			1,000,000	1,000,000
Redemption of investment securities through the exercise of the put option												2,000,000				15,700,000
Redemption of investment securities at par through normal market channels					300,000	1,300,000	3,700,000		1,700,000	38,500,000
Fair market value of investments													1,100,000
Resulted (loss) gain on revaluation of investment securities included in other (expense) income	$ 2,700,000	$ 800,000	$ (800,000)