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INCOME TAXES: (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits
Balance at January 1	$ 825	$ 698	$ 513
Additions based on tax positions related to the current year	174	257	288
Additions based on tax positions related to prior years	0	0	0
Reductions due to the statute of limitations	(77)	(130)	(103)
Balance at December 31	$ 922	$ 825	$ 698

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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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Amount of unrecognized tax benefits.

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

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