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Long-Term Debt and Other Financing Arrangements (Tables)
9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Schedule of long-term debt
Long-term debt consists of the following (in thousands): 
 
September 30, 2018
 
December 31, 2017
 
Principal
Amount
 
Unamortized Discount and Deferred Financing Costs
 
Carrying
Value
 
Principal
Amount
 
Unamortized Discount and Deferred Financing Costs
 
Carrying
Value
Facility Agreement
$
428,323

 
$
26,815

 
$
401,508

 
$
467,256

 
$
34,459

 
$
432,797

Loan Agreement with Thermo
116,105

 
23,629

 
92,476

 
106,054

 
26,333

 
79,721

8.00% Convertible Senior Notes Issued in 2013
1,363

 

 
1,363

 
1,348

 

 
1,348

Total Debt
545,791

 
50,444

 
495,347

 
574,658

 
60,792

 
513,866

Less: Current Portion
87,732

 

 
87,732

 
79,215

 

 
79,215

Long-Term Debt
$
458,059

 
$
50,444

 
$
407,615

 
$
495,443

 
$
60,792

 
$
434,651