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

 
$
143,750

Less: debt discount and issuance cost, net of amortization
(24,724
)
 
(27,890
)
Net carrying amount
$
119,026

 
$
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 June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
2.0% coupon
$
719

 
$
719

 
$
1,438

 
$
1,438

Amortization of debt issuance costs
207

 
198

 
411

 
393

Amortization of debt discount
1,391

 
1,306

 
2,755

 
2,577

Total
$
2,317

 
$
2,223

 
$
4,604

 
$
4,408