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SHORT-TERM AND LONG-TERM DEBT (New facilities) (Details) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	May 31, 2018
Debt Instrument [Line Items]
Repayments of debt	$ 218,977,000
4.875% senior unsecured convertible notes due 2023
Debt Instrument [Line Items]
Senior unsecured convertible notes interest rate (in percentage)	4.875%	4.875%
Repayments of debt	$ 2,000,000.0	$ 6,400,000	$ 8,400,000
5.75% senior unsecured convertible notes due 2021
Debt Instrument [Line Items]
Senior unsecured convertible notes interest rate (in percentage)	5.75%
Repayments of debt	$ 65,300,000	$ 0
4.875% senior unsecured convertible notes due 2023
Debt Instrument [Line Items]
Senior unsecured convertible notes interest rate (in percentage)				4.875%
5.75% senior unsecured convertible notes due 2021
Debt Instrument [Line Items]
Senior unsecured convertible notes interest rate (in percentage)				5.75%

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

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