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INCOME TAX - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at the beginning of the year	$ 21,197	$ 31,218	$ 17,916
Additions related to acquisitions	22,283	0	13,061
Reductions for income tax positions of prior years	(14,235)	(10,021)	(7,285)
Settlements with income tax authorities	(2,583)	0	(449)
Additions for income tax positions of prior years	1,803	0	411
Additions based on income tax positions related to the current year	1,206	0	7,537
Effect of foreign currency fluctuations on income tax positions	0	0	27
Balance at the end of the year	$ 29,671	$ 21,197	$ 31,218

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- Definition

Unrecognized Tax Benefits, Increase (Decreases) Resulting from Foreign Currency Translation

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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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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from acquisitions.

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

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