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Convertible Debt (Tables)
3 Months Ended
Mar. 31, 2017
Debt Disclosure [Abstract]  
Outstanding Convertible Debt and Related Deferred Financing Costs
The Company had outstanding convertible debt and related deferred financing costs on its consolidated balance sheet as follows:
 
As of
(in thousands)
March 31, 2017
 
December 31, 2016
Principal amount of the 2% Convertible Senior Notes
$
67,084

 
$
67,084

Principal amount of the 1.25% Convertible Senior Notes
345,000

 
345,000

Unamortized debt discount
(66,180
)
 
(69,684
)
Deferred financing costs
(9,142
)
 
(9,632
)
Long-term debt, net of discount
$
336,762

 
$
332,768

Interest and Other Expense
Interest expense related to the convertible notes was as follows: 
 
Three Months Ended March 31,
(in thousands)
2017
 
2016
Contractual coupon interest
$
1,413

 
$
1,006

Accretion of debt discount
3,504

 
1,702

Amortization of debt issuance costs
490

 
282

Total interest and other expense
$
5,407

 
$
2,990