SELLING, GENERAL AND ADMINISTRATIVE EXPENSES AND OTHER OPERATING EXPENSES(Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Selling, General and Administrative Expense [Abstract]
Compensation and benefits	$ 58,157,000	$ 55,577,000	$ 54,897,000
Professional services	13,421,000	23,284,000	23,183,000
Occupancy related costs	36,371,000	37,370,000	39,917,000
Amortization of intangible assets	35,367,000	47,576,000	41,135,000
Depreciation and amortization	9,178,000	10,001,000	9,781,000
Marketing costs	16,171,000	27,847,000	27,499,000
Other	23,977,000	12,500,000	24,456,000
Total	192,642,000	214,155,000	220,868,000
Accrued litigation settlement	0	32,000,000
Insurance recovery proceeds		4,000,000
Litigation settlement loss, net of $4,000 insurance recovery	0	28,000,000	0
Payment to extinguish Equator earn-out liability			500,000
Value of Equator contingent consideration after settlement with sellers			0
Change in the fair value of Equator Earn Out	$ 0	$ 0	$ 7,591,000