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STOCKHOLDERS' EQUITY - Common Stock (Details) - USD ($) $ in Thousands			9 Months Ended
	May 11, 2016	Mar. 08, 2016	Sep. 30, 2017	Sep. 30, 2016
Class of Stock [Line Items]
Net proceeds from issuance of common stock			$ 0	$ 175,090
Common Stock
Class of Stock [Line Items]
Issuance of stock shares (in shares)	5,250,000	4,850,000
Net proceeds from issuance of common stock	$ 100,000	$ 66,500
Common Stock | Over Allotment Option
Class of Stock [Line Items]
Issuance of stock shares (in shares)		727,500
Net proceeds from issuance of common stock		$ 10,500
Underwriters option period		30 days

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- Definition

The number of days the underwriters have the option to exercise their overallotment option from the closing date.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
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- Definition

Number of new stock issued during the period.

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