BORROWINGS (Details 6) (USD $)	12 Months Ended
	Dec. 31, 2013
Entity's contractual obligations (excluding interest) under borrowing agreements, payments due by period
1 - 3 years	$ 125,289,000
3 - 5 years	1,807,141,000
More than 5 years	4,142,709,000
Total borrowings	6,075,139,000
Prepayments of long-term debt	0
CLO 2005-1 notes
Entity's contractual obligations (excluding interest) under borrowing agreements, payments due by period
3 - 5 years	195,897,000
Total borrowings	195,897,000
CLO 2005-2 notes
Entity's contractual obligations (excluding interest) under borrowing agreements, payments due by period
3 - 5 years	338,773,000
Total borrowings	338,773,000
CLO 2006-1 notes
Entity's contractual obligations (excluding interest) under borrowing agreements, payments due by period
3 - 5 years	384,925,000
Total borrowings	384,925,000
CLO 2007-1 senior secured notes
Entity's contractual obligations (excluding interest) under borrowing agreements, payments due by period
More than 5 years	2,641,442,000
Total borrowings	2,641,442,000
CLO 2007-A senior secured notes
Entity's contractual obligations (excluding interest) under borrowing agreements, payments due by period
3 - 5 years	498,843,000
Total borrowings	498,843,000
CLO 2011-1 debt
Entity's contractual obligations (excluding interest) under borrowing agreements, payments due by period
3 - 5 years	388,703,000
Total borrowings	388,703,000
CLO 2012-1 notes
Entity's contractual obligations (excluding interest) under borrowing agreements, payments due by period
More than 5 years	385,500,000
Total borrowings	385,500,000
CLO 2013-1 notes
Entity's contractual obligations (excluding interest) under borrowing agreements, payments due by period
More than 5 years	458,500,000
Total borrowings	458,500,000
Total credit facilities
Entity's contractual obligations (excluding interest) under borrowing agreements, payments due by period
1 - 3 years	125,289,000
Total borrowings	125,289,000
Senior notes
Entity's contractual obligations (excluding interest) under borrowing agreements, payments due by period
More than 5 years	373,750,000
Total borrowings	373,750,000
Junior subordinated notes
Entity's contractual obligations (excluding interest) under borrowing agreements, payments due by period
More than 5 years	283,517,000
Total borrowings	$ 283,517,000