INCOME TAXES (Details) - USD ($)	3 Months Ended		9 Months Ended		33 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Current tax expense (benefit)	$ 1,500,000	$ 8,300,000	$ 3,300,000	$ 11,800,000
Deferred Income tax expense (benefit)	(1,900,000)	400,000	(6,600,000)	$ (6,300,000)
Deferred tax asset relating to capital losses	10,200,000		10,200,000		$ 10,200,000
Interest and penalties recognized for uncertain tax positions	0		0		$ 0
Percentage of applicable cash saving in income tax distributable to specified unitholders					85.00%
Percentage of applicable cash saving in income tax available for the entity					15.00%
Amount due pursuant to tax receivable agreement	2,438,000		2,438,000		$ 2,438,000	$ 2,520,000
Other Assets
Income Tax Contingency [Line Items]
Net deferred tax assets	6,700,000		6,700,000		6,700,000	2,100,000
Accrued Expenses
Income Tax Contingency [Line Items]
Liability for unrecognized tax benefits for uncertain income tax positions	800,000		800,000		800,000	800,000
Amount Payable Pursuant to Tax Receivable Agreement
Income Tax Contingency [Line Items]
Amount due pursuant to tax receivable agreement	$ 2,400,000		2,400,000		$ 2,400,000	2,500,000
Indemnity Counterparty
Income Tax Contingency [Line Items]
Settlements receivable						3,300,000
Amount recovered from indemnity counterparty			$ 3,300,000
State and Local Jurisdiction | New York
Income Tax Contingency [Line Items]
State income tax expense (benefit)		$ 3,300,000
Estimated insurance recovery recorded as other income and fees						3,300,000
State income tax payable						$ 3,300,000