Accrued Expenses (Tables)
 6 Months Ended
Jun. 30, 2018
Payables and Accruals [Abstract]  
Summary of Accrued Expenses

Accrued expenses as of June 30, 2018 and December 31, 2017 are comprised of the following (in thousands):

 

     June 30,
2018		      December 31,
2017		  

Payroll, benefits and related taxes, excluding severance benefits

    $ 16,378      $ 16,724  

Withholding tax attributable to intercompany interest income

      19,264        18,138  

Interest on senior notes

      8,268        8,268  

Outside service fees

      1,089        1,942  

Others

      4,507        6,674  
  

 

 

     

 

 

  

Accrued expenses

    $ 49,506      $ 51,746