ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated other comprehensive income (loss)
Beginning balances	$ 676,323	$ 363,492	$ 1,011,380	$ 359,217
Ending balances	672,947	376,759	672,947	376,759
Foreign Currency Translation
Accumulated other comprehensive income (loss)
Beginning balances			(10,925)	(14,697)
Other comprehensive income (loss) before reclassifications, net of tax			(5,251)	3,369
Other comprehensive income, (loss), net			(5,251)	3,369
Ending balances	(16,176)	(11,328)	(16,176)	(11,328)
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			(9,892)	(1,658)
Amounts reclassified out of AOCI, net of tax			800	(210)
Other comprehensive income, (loss), net			(9,092)	(1,868)
Ending balances	(10,021)	(962)	(10,021)	(962)
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss)
Beginning balances	(26,211)	(12,793)	(11,854)	(13,791)
Other comprehensive income (loss) before reclassifications, net of tax			(15,143)	1,711
Amounts reclassified out of AOCI, net of tax			800	(210)
Other comprehensive income, (loss), net	14	503	(14,343)	1,501
Ending balances	$ (26,197)	$ (12,290)	$ (26,197)	$ (12,290)

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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