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SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENT INFORMATION - Deferred Costs and Deferred Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jan. 01, 2020	Dec. 31, 2019	Jan. 01, 2019
Deferred Costs					$ 2,525		$ 6,994
Total deferred costs amortized	$ 5,499	$ 7,542	$ 10,895	$ 20,447
Deferred revenue	1,159	8,538	1,159	8,538	$ 3,481	$ 3,481	$ 10,501
Revenue recognized that was included in deferred revenue balances at beginning of period	254	1,284	3,347	8,177
Prepaid expenses and other current assets
Deferred Costs	$ 878	$ 4,590	$ 878	$ 4,590

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- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
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