INCOME TAXES (Details) - USD ($)		3 Months Ended			11 Months Ended
	Feb. 27, 2015	Mar. 31, 2017	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2014	Dec. 31, 2016
Income Tax Contingency [Line Items]
Current tax expense (benefit)		$ 2,200,000		$ 1,100,000
Deferred Income tax expense (benefit)		(3,600,000)		$ (2,000,000.0)
Deferred tax asset relating to capital losses		6,000,000.0
Interest and penalties recognized for uncertain tax positions		0
Percentage of applicable cash saving in income tax distributable to specified unitholders	85.00%				85.00%
Percentage of applicable cash saving in income tax available for the entity	15.00%				15.00%
Amount due pursuant to tax receivable agreement		2,330,000				$ 2,520,000
Other Assets
Income Tax Contingency [Line Items]
Net deferred tax assets		4,800,000				2,100,000
Accrued Expenses
Income Tax Contingency [Line Items]
Liability for unrecognized tax benefits for uncertain income tax positions		800,000				800,000
Amount Payable Pursuant to Tax Receivable Agreement
Income Tax Contingency [Line Items]
Amount due pursuant to tax receivable agreement		2,300,000
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
State income tax payable						3,300,000
Estimated insurance recovery recorded as other income and fees						$ 3,300,000