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Schedule II-Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Schedule II-Valuation and Qualifying Accounts [Abstract]  
Schedule II-Valuation and Qualifying Accounts
Schedule II—Valuation and Qualifying Accounts

(in thousands)

Description
 
Balance at
Beginning
 of Period
  
Charged to
Expense
  
Accounts
 Written-off
  
Balance at
 End of
Period
 
Allowance accounts for the year ended:
            
             
December 31, 2017 Student receivable allowance
 
$
14,794
  
$
13,720
  
$
(14,730
)
 
$
13,784
 
December 31, 2016 Student receivable allowance
 
$
14,074
  
$
14,592
  
$
(13,872
)
 
$
14,794
 
December 31, 2015 Student receivable allowance
 
$
14,849
  
$
13,583
  
$
(14,358
)
 
$
14,074