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Convertible debt (Tables)
 9 Months Ended
Sep. 30, 2016
Debt Disclosure [Abstract]  
Convertible Debt [Table Text Block]
The Senior Notes consist of the following (in thousands):
 
September 30, 2016
 
December 31, 2015
Liability component:
 
 
 
Principal
$
143,750

 
$
143,750

Less: debt discount and issuance cost, net of amortization
(23,103
)
 
(27,890
)
Net carrying amount
$
120,647

 
$
115,860

 
 
 
 
Equity component (1)
$
28,714

 
$
28,714

(1) Recorded in the consolidated balance sheet within additional paid-in capital, net of $1.2 million issuance cost in equity.

The following table sets forth total interest expense recognized related to the Senior Notes (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
2.0% coupon
$
719

 
$
719

 
$
2,157

 
$
2,157

Amortization of debt issuance costs
209

 
199

 
620

 
592

Amortization of debt discount
1,411

 
1,316

 
4,166

 
3,893

Total
$
2,339

 
$
2,234

 
$
6,943

 
$
6,642