INVESTMENTS (Investments of the Consolidated Funds) (Details) - Consolidated Funds $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2018 USD ($) issuer	Dec. 31, 2017 USD ($) issuer
Investments
Investments	$ 5,479,136	$ 5,582,842
Number of single issuers above 5% \| issuer	0	0
Single issuer or investor threshold, as a percent	5.00%	5.00%
Fixed Income
Investments
Investments	$ 5,007,793	$ 5,115,374
Percentage of total investments	91.50%	91.60%
Equity securities
Investments
Investments	$ 218,643	$ 235,136
Percentage of total investments	3.90%	4.20%
Partnership Interests \| Partnership and interests
Investments
Investments	$ 252,700	$ 232,332
Percentage of total investments	4.60%	4.20%
United States \| Fixed Income
Investments
Investments	$ 3,388,108	$ 3,447,953
Percentage of total investments	62.10%	61.80%
Investments, at cost	$ 3,393,506	$ 3,459,318
United States \| Fixed Income \| Consumer discretionary
Investments
Investments	$ 1,303,537	$ 1,295,732
Percentage of total investments	24.10%	23.20%
United States \| Fixed Income \| Consumer staples
Investments
Investments	$ 56,917	$ 55,073
Percentage of total investments	1.00%	1.00%
United States \| Fixed Income \| Energy
Investments
Investments	$ 173,698	$ 176,836
Percentage of total investments	3.20%	3.20%
United States \| Fixed Income \| Financials
Investments
Investments	$ 270,317	$ 270,520
Percentage of total investments	4.90%	4.80%
United States \| Fixed Income \| Healthcare, education and childcare
Investments
Investments	$ 453,622	$ 449,888
Percentage of total investments	8.30%	8.10%
United States \| Fixed Income \| Industrials
Investments
Investments	$ 364,479	$ 370,926
Percentage of total investments	6.70%	6.60%
United States \| Fixed Income \| Information technology
Investments
Investments	$ 146,733	$ 167,089
Percentage of total investments	2.70%	3.00%
United States \| Fixed Income \| Materials
Investments
Investments	$ 170,309	$ 185,170
Percentage of total investments	3.10%	3.30%
United States \| Fixed Income \| Telecommunication services
Investments
Investments	$ 385,829	$ 399,617
Percentage of total investments	7.00%	7.20%
United States \| Fixed Income \| Utilities
Investments
Investments	$ 62,667	$ 77,102
Percentage of total investments	1.10%	1.40%
United States \| Equity securities
Investments
Investments	$ 60	$ 126
Percentage of total investments	0.00%	0.00%
Investments, at cost	$ 2,265	$ 2,265
United States \| Equity securities \| Energy
Investments
Investments	$ 60	$ 126
Percentage of total investments	0.00%	0.00%
United States \| Partnership Interests
Investments
Investments	$ 252,700	$ 232,332
Percentage of total investments	4.60%	4.20%
Investments, at cost	$ 200,000	$ 190,000
United States \| Partnership Interests \| Partnership and interests
Investments
Investments	$ 252,700	$ 232,332
Percentage of total investments	4.60%	4.20%
Europe \| Fixed Income
Investments
Investments	$ 1,497,652	$ 1,537,889
Percentage of total investments	27.20%	27.60%
Investments, at cost	$ 1,507,741	$ 1,545,297
Europe \| Fixed Income \| Consumer discretionary
Investments
Investments	$ 603,516	$ 604,608
Percentage of total investments	11.00%	10.80%
Europe \| Fixed Income \| Consumer staples
Investments
Investments	$ 72,317	$ 76,361
Percentage of total investments	1.30%	1.40%
Europe \| Fixed Income \| Energy
Investments
Investments	$ 2,461	$ 2,413
Percentage of total investments	0.00%	0.00%
Europe \| Fixed Income \| Financials
Investments
Investments	$ 116,836	$ 81,987
Percentage of total investments	2.10%	1.50%
Europe \| Fixed Income \| Healthcare, education and childcare
Investments
Investments	$ 187,032	$ 209,569
Percentage of total investments	3.40%	3.80%
Europe \| Fixed Income \| Industrials
Investments
Investments	$ 128,345	$ 145,706
Percentage of total investments	2.30%	2.60%
Europe \| Fixed Income \| Information technology
Investments
Investments	$ 20,603	$ 21,307
Percentage of total investments	0.40%	0.40%
Europe \| Fixed Income \| Materials
Investments
Investments	$ 184,625	$ 213,395
Percentage of total investments	3.40%	3.80%
Europe \| Fixed Income \| Telecommunication services
Investments
Investments	$ 181,917	$ 182,543
Percentage of total investments	3.30%	3.30%
Europe \| Equity securities
Investments
Investments	$ 61,065	$ 63,155
Percentage of total investments	1.10%	1.10%
Investments, at cost	$ 67,198	$ 67,198
Europe \| Equity securities \| Healthcare, education and childcare
Investments
Investments	$ 61,065	$ 63,155
Percentage of total investments	1.10%	1.10%
Asia and other \| Fixed Income
Investments
Investments	$ 46,174	$ 36,309
Percentage of total investments	0.80%	0.60%
Investments, at cost	$ 46,287	$ 36,180
Asia and other \| Fixed Income \| Consumer discretionary
Investments
Investments	$ 2,019	$ 2,008
Percentage of total investments	0.00%	0.00%
Asia and other \| Fixed Income \| Financials
Investments
Investments	$ 22,476	$ 12,453
Percentage of total investments	0.40%	0.20%
Asia and other \| Fixed Income \| Telecommunication services
Investments
Investments	$ 21,679	$ 21,848
Percentage of total investments	0.40%	0.40%
Asia and other \| Equity securities
Investments
Investments	$ 157,518	$ 165,943
Percentage of total investments	2.80%	3.00%
Investments, at cost	$ 122,418	$ 122,418
Asia and other \| Equity securities \| Consumer discretionary
Investments
Investments	$ 50,071	$ 59,630
Percentage of total investments	0.90%	1.10%
Asia and other \| Equity securities \| Consumer staples
Investments
Investments	$ 46,232	$ 45,098
Percentage of total investments	0.80%	0.80%
Asia and other \| Equity securities \| Healthcare, education and childcare
Investments
Investments	$ 44,637	$ 44,637
Percentage of total investments	0.80%	0.80%
Asia and other \| Equity securities \| Industrials
Investments
Investments	$ 16,578	$ 16,578
Percentage of total investments	0.30%	0.30%
Canada \| Fixed Income
Investments
Investments	$ 65,653	$ 80,797
Percentage of total investments	1.20%	1.40%
Investments, at cost	$ 65,501	$ 80,201
Canada \| Fixed Income \| Consumer discretionary
Investments
Investments	$ 7,474	$ 6,757
Percentage of total investments	0.10%	0.10%
Canada \| Fixed Income \| Consumer staples
Investments
Investments	$ 19,364	$ 15,351
Percentage of total investments	0.40%	0.30%
Canada \| Fixed Income \| Energy
Investments
Investments	$ 14,103	$ 33,715
Percentage of total investments	0.30%	0.60%
Canada \| Fixed Income \| Industrials
Investments
Investments	$ 18,667	$ 18,785
Percentage of total investments	0.30%	0.30%
Canada \| Fixed Income \| Telecommunication services
Investments
Investments	$ 6,045	$ 6,189
Percentage of total investments	0.10%	0.10%
Canada \| Equity securities
Investments
Investments	$ 0	$ 5,912
Percentage of total investments	0.00%	0.10%
Investments, at cost	$ 0	$ 17,202
Canada \| Equity securities \| Energy
Investments
Investments	$ 0	$ 5,912
Percentage of total investments	0.00%	0.10%
Australia \| Fixed Income
Investments
Investments	$ 10,206	$ 12,426
Percentage of total investments	0.20%	0.20%
Investments, at cost	$ 10,446	$ 12,714
Australia \| Fixed Income \| Consumer discretionary
Investments
Investments	$ 8,587	$ 10,863
Percentage of total investments	0.20%	0.20%
Australia \| Fixed Income \| Energy
Investments
Investments	$ 1,619	$ 1,563
Percentage of total investments	0.00%	0.00%

Represents the number of single issuers above reporting threshold.

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- Definition

Percent by which the fair value of a single issuer or investment exceeds the entity's total consolidated net assets. This is used as a threshold for a count of such issuers or investments at balance sheet date.

+ References

No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Cost of the investment.

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- Definition

Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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