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ISSUANCE OF EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	9 Months Ended
	Jun. 26, 2017	Jun. 07, 2017	Jun. 26, 2017	Sep. 30, 2017	Sep. 30, 2016
Equity
Issuance of stock on underwritten public offering (in shares)		7,000,000
Price per share		$ 35.00
Net proceeds received from the offerings			$ 253,400	$ 253,389	$ 144,247
Underwriting discount and commissions and other stock issuance costs			$ 7,300
Over-Allotment Option
Equity
Issuance of stock on underwritten public offering (in shares)	450,000
Price per share	$ 35.00		$ 35.00

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Number of new stock issued during the period.

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