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SIGNIFICANT ACCOUNTING POLICIES - Allowance activity (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) customer	Dec. 31, 2019 USD ($) customer	Dec. 31, 2018 USD ($) customer
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year		$ 5,773	$ 5,329	$ 2,979
Increase to allowance based on a percent of revenue		1,212	2,641	2,253
Adjustment based on aged receivable analysis		5,161	(88)	(43)
Charge-offs		(3,003)	(2,504)	(23)
Recoveries		14	395	163
Balance at end of year	$ 9,157	9,157	$ 5,773	$ 5,329
Notes Receivables		$ 3,000
Concentrations of credit and customer risk
Number of customers accounting for more than 10% of consolidated revenues | customer		0	0	0
Notes receivable with affiliates
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at end of year	0	$ 0
Notes Receivables	$ 3,000

X

- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 50
-Paragraph 13
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-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446

+ Details

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Period Type:	instant

X

- Definition

Amount of increase (decrease) in allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

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X

- Definition

Amount of increase in allowance for credit loss on accounts receivable, from recovery.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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X

- Definition

The cash outflow to acquire an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
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-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

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X

- Definition

Amount of increase (decrease) in allowance on accounts receivable based on accounts receivable.

+ References

No definition available.

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X

- Definition

Amount of increase (decrease) in allowance on accounts receivable based on revenue.

+ References

No definition available.

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- Definition

n/a

+ References

No definition available.

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- Definition

Represents the number of customers that accounted for more than 10% of the Company's consolidated revenues.

+ References

No definition available.

+ Details

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- Details

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Balance Type:
Period Type: