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Restructuring and Severance Charges (Tables)
 12 Months Ended
Dec. 31, 2018
Restructuring and Severance Charges [Abstract]  
Restructuring and Severance Charges

  
December 31, 2018
 
    
Restructuring, severance and impairment charges incurred
 
$
70,686
 
Non-cash impairment charges
  
(48,551
)
Amounts paid
  
(6,673
)
Adjustments
  
—
 
Balance December 31, 2018
 
$
15,462