OTHER ASSETS AND OTHER LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Other assets
Prepaid bonuses	$ 31,847	$ 36,797
Deferred tax assets	41,567	47,617
Investments accounted for under the cost method and equity method	31,414	35,960
Forgivable employee loans and advances to employees	31,655	23,909
Software inventory, net	4,615	6,909
Financial instruments owned	25,250	6,864
Deferred financing fees	8,074	10,290
Other	28,774	30,323
Total Other assets	$ 203,196	$ 198,669