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DEBT (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Schedule of debt
A summary of the gross carrying amount, unamortized debt cost, debt issuance costs and net carrying value of the liability component of the 2025 Notes, all of which is recorded as a non-current liability in the December 31, 2021 consolidated balance sheet, are as follows (in thousands):
 December 31,
2021		December 31,
2020
Gross carrying amount$575,000 $575,000 
Unamortized debt discount87,994 110,110 
Debt issuance costs8,855 11,056 
Net carrying amount$478,151 $453,834 
A summary of the gross carrying amount, unamortized debt cost, debt issuance costs and net carrying value of the liability component of the 2022 Notes, all of which is recorded as a current liability in the December 31, 2021 consolidated balance sheet, are as follows (in thousands):
 December 31,
2021		December 31,
2020
Gross carrying amount$169,659 $169,690 
Unamortized debt discount3,260 10,815 
Debt issuance costs391 1,297 
Net carrying amount$166,008 $157,578