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DEBT (Tables)
 9 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]  
Summary of Convertible Debt The following table summarizes information regarding the Company’s convertible debt: 
 
September 30,
2019
 
December 31,
2018
1.50% senior subordinated convertible notes due in October 2020 (the 2020 Notes)
374,993

 
374,993

Unamortized discount
(15,780
)
 
(26,581
)
Unamortized deferred offering costs
(1,359
)
 
(2,334
)
Convertible Notes due in 2020, net
357,854

 
346,078

 
 
 
 
0.599% senior subordinated convertible notes due in August 2024 (the 2024 Notes)
495,000

 
495,000

Unamortized discount
(6,887
)
 
(7,946
)
Unamortized deferred offering costs
(2,351
)
 
(2,715
)
Convertible Notes due in 2024, net
485,762

 
484,339

 
 
 
 
Total convertible debt, net
$
843,616

 
$
830,417

 
 
 
 
Fair value of fixed rate convertible debt
 
 
 
Convertible Notes due in October 2020 (1)
384,713

 
419,722

Convertible Notes due in August 2024 (1)
490,297

 
491,626

Total fair value of fixed rate convertible debt
$
875,010

 
$
911,348

 
(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. For additional discussion of fair value measurements, see Note 3 – Summary of Significant Accounting Policies included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.
Summary of Interest Expense on Debt
Interest expense on the Company’s convertible debt consisted of the following: 
 
Three Months Ended September 30,
 
Nine Months Ended
September 30,
 
2019
 
2018
 
2019
 
2018
Coupon interest expense
$
2,271

 
$
3,331

 
$
6,681

 
$
9,819

Amortization of debt issuance costs
508

 
1,008

 
1,522

 
3,018

Accretion of discount on convertible notes
4,005

 
7,792

 
11,860

 
23,081

Total interest expense on convertible debt
$
6,784

 
$
12,131

 
$
20,063

 
$
35,918