ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Accumulated other comprehensive income (loss)
Beginning balances	$ 1,011,380	$ 359,217
Ending balances	676,323	363,492
Foreign Currency Translation
Accumulated other comprehensive income (loss)
Beginning balances	(10,925)	(14,697)
Other comprehensive income (loss) before reclassifications, net of tax	(8,259)	1,689
Other comprehensive income, (loss), net	(8,259)	1,689
Ending balances	(19,184)	(13,008)
Unrealized Gain (Loss) on Interest Rate Hedge
Accumulated other comprehensive income (loss)
Beginning balances	(929)	906
Other comprehensive income (loss) before reclassifications, net of tax	(6,310)	(581)
Amounts reclassified out of AOCI, net of tax	212	(110)
Other comprehensive income, (loss), net	(6,098)	(691)
Ending balances	(7,027)	215
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss)
Beginning balances	(11,854)	(13,791)
Other comprehensive income (loss) before reclassifications, net of tax	(14,569)	1,108
Amounts reclassified out of AOCI, net of tax	212	(110)
Other comprehensive income, (loss), net	(14,357)	998
Ending balances	$ (26,211)	$ (12,793)

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 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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