NONCONTROLLING INTERESTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
RSO [Member]
Activity in noncontrolling interests [Roll Forward]
Noncontrolling interests, beginning of year				$ 743,364					$ 743,364
Net income attributable to noncontrolling interests	(12,547)	(14,214)	(17,405)	(17,151)	(1,187)	(23,708)	(8,372)	(12,314)	61,317	45,581	62,560
Noncontrolling interests, end of year	916,543				743,364				916,543	743,364
Other [Member]
Activity in noncontrolling interests [Roll Forward]
Noncontrolling interests, beginning of year				238					238
Net income attributable to noncontrolling interests	(56)	11	(84)	40	3	(40)	(26)	43	89	20	557
Noncontrolling interests, end of year	306				238				306	238
Noncontrolling Interests [Member] | RSO [Member]
Activity in noncontrolling interests [Roll Forward]
Noncontrolling interests, beginning of year				743,364				582,323	743,364	582,323	399,288
Net income attributable to noncontrolling interests									61,317	45,581	62,560
Other comprehensive income									18,088	13,035	19,249
Net proceeds from issuance of equity interests, net of shares repurchased									196,211	190,222	170,928
Amortization of stock-based compensation									6,567	10,472	4,636
Discount on RSO senior convertible notes									0	4,851	0
Contributions, net of distributions from non-controlling interests									11,141	0	0
Distributions to noncontrolling interests									(120,179)	(103,120)	(74,340)
Other									34	0	2
Noncontrolling interests, end of year	916,543				743,364				916,543	743,364	582,323
Noncontrolling Interests [Member] | Other [Member]
Activity in noncontrolling interests [Roll Forward]
Noncontrolling interests, beginning of year				238				279	238	279	319
Net income attributable to noncontrolling interests									89	20	557
Other comprehensive income									0	0	0
Net proceeds from issuance of equity interests, net of shares repurchased									0	24	0
Amortization of stock-based compensation									0	0	0
Discount on RSO senior convertible notes									0	0	0
Contributions, net of distributions from non-controlling interests									0	0	0
Distributions to noncontrolling interests									(21)	(85)	(595)
Other									0	0	(2)
Noncontrolling interests, end of year	$ 306				$ 238				$ 306	$ 238	$ 279