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INCOME TAXES - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits at January 1	$ 4,528	$ 8,969	$ 8,888
Increases related to current year tax positions	74	139	36
Increases related to prior period tax positions	122	430	723
Increases related to business acquisitions	0	2,012	0
Decreases related to prior period tax positions	(1,263)	(7,022)	(81)
Settlements	0	0	(597)
Unrecognized tax benefits at December 31	$ 3,461	$ 4,528	$ 8,969

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

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