GAIN ON INVESTMENTS, NET (Details) (USD $)	12 Months Ended			1 Months Ended	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2011 Common Shares	Jun. 30, 2011 Common Shares	Mar. 14, 2011 Common Shares
Gain on investments, net
Gain on auction rate floating securities (as described in note 7)	$ 1,859,000	$ 0	$ 0
Gain on disposal of investments	3,963,000	2,056,000	22,776,000
Gain on investments, net	5,822,000	2,056,000	22,776,000
Marketable securities by major security type
Investment in available-for-sale equity securities				60,000,000
Number of shares of common stock acquired				1,034,908
Percentage of outstanding common stock acquired						1.366%
Net proceeds from disposal of investment					81,300,000
Net realized gain					$ 21,300,000