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COMMITMENTS AND CONTINGENCIES - Contractual obligations and commercial commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments And Contingencies Disclosure [Abstract]
Outstanding letters of credit	$ 16,700
Outstanding purchase commitments, including agreements that are non-cancelable and cancelable	31,700
Uncertain Tax Positions
Gross unrecognized tax benefits	17,496	$ 18,728	$ 20,137	$ 22,694
Unrecognized tax benefits that would impact the annual effective tax rate if recognized	829	$ 2,061	$ 3,470
Unrecognized tax benefits if recognized, would impact certain deferred tax assets	$ 16,600

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Represents the portion of unrecognized tax benefits, which is related to deferred tax assets and the federal tax benefit of state income tax items.

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