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OTHER (LOSS) INCOME
 12 Months Ended
Dec. 31, 2019
Other Income And Expenses [Abstract]  
OTHER (LOSS) INCOME

17. OTHER (LOSS) INCOME

The following table summarizes other income and loss for the periods indicated:

 

 

 

For the Year Ended December 31,

 

 

 

2019

 

 

2018

 

 

2017

 

 

 

(in thousands)

 

Interest expense

 

$

(30,669

)

 

$

(33,709

)

 

$

(5,801

)

Interest income

 

 

7,238

 

 

 

6,810

 

 

 

1,809

 

Amortization of investment discount

 

 

15,350

 

 

 

8,573

 

 

 

1,401

 

Other expense

 

 

(236

)

 

 

(656

)

 

 

601

 

Gain from sale of Priority Review Voucher

 

 

—

 

 

 

—

 

 

 

125,000

 

Total other (loss) income

 

$

(8,317

)

 

$

(18,982

)

 

$

123,010