RESTRICTED CASH AND CASH EQUIVALENTS (Tables)

12 Months Ended

Dec. 31, 2017

Cash and Cash Equivalents [Abstract]

Schedule of Restricted Cash and Cash Equivalents

	December 31, 2017		December 31, 2016
	($ in thousands)
Cash held by prime brokers relating to securities sold, not yet purchased	$	912,796	$	859,901
Cash collateral relating to letters of credit issued	173,748		234,348
Cash held as collateral in trust accounts	377,932		86,351
Cash and cash equivalents held by swap counterparties	39,337		22,051
Total restricted cash and cash equivalents	$	1,503,813	$	1,202,651