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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stock-based Compensation (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage vesting upon retirement for each full year of employment subsequent to the grant date	25.00%

X

- 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.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of vesting of award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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