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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Notes Payable
Total convertible notes payable consisted of the following at (in thousands):
 
 
 
December 31,

2018
 
 
December 31,

2017
 
Principal amount of Notes
 
$
325,000
 
 
$
325,000
 
Unamortized debt issuance costs
 
 
(5,813
)
 
 
(7,237
)
Total convertible notes payable
 
$
319,187
 
 
$
317,763
 
Interest Expense
Interest expense incurred in connection with the Notes consisted of the following for the years ended December 31 (in thousands):
 
 
 
2018
 
 
2017
 
 
2016
 
Coupon interest at 3.75%
 
$
12,188
 
 
$
12,188
 
 
$
11,240
 
Amortization of debt issuance costs
 
 
1,424
 
 
 
1,424
 
 
 
1,305
 
Total interest expense on Notes
 
$
13,612
 
 
$
13,612
 
 
$
12,545