LOANS RECEIVABLE AND INVESTMENTS (Details) (USD $)	1 Months Ended	6 Months Ended			6 Months Ended				6 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Eight Percent Loan Receivable Maturing in 2017 [Member]	Dec. 31, 2012 Eight Percent Loan Receivable Maturing in 2017 [Member]	Jun. 30, 2014 Secured notes and loans receivable, net	Jun. 30, 2014 Other assets	Jun. 30, 2014 Government-sponsored pooled loan investments	Jun. 30, 2014 Marketable securities	Jun. 30, 2014 Senior unsecured corporate bonds	Jun. 30, 2014 Marketable equity securities	Jun. 30, 2014 Secured mortgage loans and other	Jun. 30, 2014 Unsecured loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Secured loan receivable, carrying amount and amortized cost					$ 175,400,000								$ 353,089,000	$ 41,365,000
Mortgage loans, fair value													352,211,000	42,031,000
Available-for-sale securities, amortized cost basis									61,000,000	46,689,000
Available-for-sale securities, fair value and carrying amount									60,962,000	48,082,000
Available-for-sale securities, unrealized gain (loss)	1,355,000	1,355,000					(38,000)	1,393,000	(38,000)	1,393,000
Secured loans, unsecured loans, and other available-for-sale securities, carrying amount	503,498,000	503,498,000		414,800,000			414,051,000	89,447,000
Secured loans, unsecured loans, and other available-for-sale securities, amortized cost	502,143,000	502,143,000					414,089,000	88,054,000
Secured loans, unsecured loans, and other available-for-sale securities, fair value	503,286,000	503,286,000					413,173,000	90,113,000
Purchase of marketable securities		46,689,000	0								25,000,000	21,700,000
Investment in loans receivable and other		44,488,000	32,332,000						38,700,000
Secured loan receivable, amount						375,000,000
Secured loan receivable, interest rate					10.60%
Gain on the repayment of loans receivable	$ 2,800,000