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INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Activity related to unrecognized tax benefits
Gross unrecognized tax benefits at the beginning of the period	$ 20,961	$ 17,904	$ 17,216
Increase in unrecognized tax benefits taken during a prior period	7,293		561
Increase in unrecognized tax benefits taken during the current period	3,408	3,394	2,321
Lapse in statute of limitations	(1,430)	(2)	(1,673)
Settlements		(335)	(521)
Gross unrecognized tax benefits at the end of the period	30,232	20,961	17,904
Interest and penalties accrued	4,500	$ 3,100	$ 2,100
Unrecognized tax benefits that would affect the effective tax rate if recognized	$ 34,700

X

- Definition

Amount of unrecognized tax benefits, excluding interest and penalties.

+ References

No definition available.

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- Definition

The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 15A
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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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- Definition

Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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