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STOCKHOLDERS' EQUITY - Changes in AOCI by Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 501,565	$ 483,606	$ 473,849	$ 499,215	$ 513,272	$ 506,063
Net unrealized gains (losses) arising during the period	(1,317)	(394)	(641)	175	(644)	409
Less: Net realized gains (losses) reclassified to net income	(318)	(357)	(125)	0	0	0
Net change during the period	(999)	(37)	(516)	175	(644)	409
Balance at end of period	515,058	501,565	483,606	479,887	499,215	513,272
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(3,896)	(3,859)	(3,343)	(2,620)	(1,976)	(2,385)
Balance at end of period	(4,895)	(3,896)	(3,859)	(2,445)	(2,620)	(1,976)
Foreign Currency Translation and Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(2,395)	(2,280)	(2,578)	(2,620)	(1,976)	(2,385)
Net unrealized gains (losses) arising during the period	(463)	(115)	298	206	(644)	409
Less: Net realized gains (losses) reclassified to net income	0	0	0	0	0	0
Net change during the period	(463)	(115)	298	206	(644)	409
Balance at end of period	(2,858)	(2,395)	(2,280)	(2,414)	(2,620)	(1,976)
Other comprehensive income (loss) before reclassifications, tax benefit	288	93	308
Reclassification from AOCI, current period, tax benefit	106				121	42
Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(1,501)	(1,579)	(765)	0	0	0
Net unrealized gains (losses) arising during the period	(854)	(279)	(939)	(31)	0	0
Less: Net realized gains (losses) reclassified to net income	(318)	(357)	(125)	0	0	0
Net change during the period	(536)	78	(814)	(31)	0	0
Balance at end of period	$ (2,037)	$ (1,501)	$ (1,579)	$ (31)	$ 0	$ 0

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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 after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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