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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loss on Debt Extinguishment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Feb. 28, 2019	Dec. 31, 2017	Nov. 15, 2016	Nov. 10, 2016	Nov. 04, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loss on debt extinguishment	$ 4,533
$400 Million Credit Facility | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Face amount of term loan facility	400,000			$ 400,000		$ 400,000
$98 Million Credit Facility | Line of Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Face amount of term loan facility	98,000			$ 98,000	$ 98,000		$ 98,000
$495 Million Credit Facility | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Face amount of term loan facility	$ 495,000	$ 495,000	$ 495,000

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=114001942&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114001942&loc=d3e12317-112629

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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