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Debt (Tables)
12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of Debt
Total debt consists of the following:
 
December 31,
 
2017
 
2016
Convertible Senior Notes
$
230,000

 
$
230,000

Amended Credit Agreement

 
29,000

 Total debt, principal amount
230,000

 
259,000

Debt issuance costs
(2,296
)
 
(3,709
)
 Total debt, carrying value
$
227,704

 
$
255,291

 Total short term debt, carrying value
$

 
$
29,000

 Total long-term debt, carrying value
$
227,704

 
$
226,291

Schedule of Long-term Debt Instruments
Interest expense for the Company’s 2019 Notes related to the contractual interest coupon and contingent interest liability is noted below.
 
Year ended December 31,
 
2017
 
2016
 
2015
Contractual interest expense
$
1,725

 
$
1,725

 
$
1,725

Contingent interest expense
193

 

 

 Total
$
1,918

 
$
1,725

 
$
1,725

Schedule of Line of Credit Facilities
Interest expense and commitment fees under the 2017 Credit Agreement and the Amended Credit Facility were as follows:
 
Year ended December 31,
 
2017
 
2016
 
2015
Commitment fees
$
519

 
$
415

 
$
332

Interest expense
35,351

 
877