BASIS OF PRESENTATION - Long-Term Receivables (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	$ 97,530	$ 90,224
Additions:
Advances and other loans, including interest receivable	3,027	8,812
Development fees, including interest receivable	2,931	6,887
Management and service fees	2,638	2,638
Deductions:
Payments	(1,453)	(3,888)
Balance, end of period	104,673	104,673
Current portion of long-term receivables	10,900	10,900	$ 1,600	$ 4,900
Interest receivable	58,600	58,600	$ 56,100	$ 51,000
Affiliates
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	93,138	86,851
Additions:
Advances and other loans, including interest receivable	2,350	7,029
Development fees, including interest receivable	2,931	6,887
Management and service fees	2,638	2,638
Deductions:
Payments	(1,409)	(3,757)
Balance, end of period	99,648	99,648
Others
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	4,392	3,373
Additions:
Advances and other loans, including interest receivable	677	1,783
Development fees, including interest receivable	0	0
Management and service fees	0	0
Deductions:
Payments	(44)	(131)
Balance, end of period	$ 5,025	$ 5,025