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DEBT (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Summary of Senior Subordinated Convertible Obligations The Notes are senior subordinated convertible obligations, and
interest is payable in arrears, semi-annually. The following table summarizes information regarding the Company’s convertible debt: 
December 31,
20212020
1.25% senior subordinated convertible notes due in May 2027 (the 2027 Notes)
$600,000 $600,000 
Unamortized discount net of deferred offering costs(10,971)(12,995)
2027 Notes, net589,029 587,005 
0.599% senior subordinated convertible notes due in August 2024 (the 2024 Notes)
495,000 495,000 
Unamortized discount net of deferred offering costs(4,952)(6,860)
2024 Notes, net490,048 488,140 
Total convertible debt, net$1,079,077 $1,075,145 
Fair value of fixed rate convertible debt (1):
2027 Notes
$625,122 $627,090 
2024 Notes
521,082 530,714 
Total fair value of fixed rate convertible debt$1,146,204 $1,157,804 
(1)The fair value of the Company’s fixed-rate convertible debt is based on open market trades and is classified as Level 1 in the fair value hierarchy. See Note 1 to these Consolidated Financial Statements for additional discussion of fair value measurements.
Summary of Interest Expense on Debt
Interest expense on the Company’s convertible debt consisted of the following:
Years Ended December 31,
202120202019
Coupon interest expense$10,465 $12,350 $4,907 
Accretion of discount on convertible notes3,339 14,682 15,917 
Amortization of debt issuance costs593 1,829 2,031 
Total interest expense on convertible debt$14,397 $28,861 $22,855