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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts
(In thousands)
Balance at
Beginning of
Period
 
Charged to
Costs and
Expenses
 
Write-offs
(Recoveries)
of Doubtful
Accounts
 
Balance at
End of
Period
Year ended December 31, 2017:
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
9,183

 
$
184

 
$
1,117

 
$
8,250

Year ended December 31, 2016:
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
10,298

 
$
(245
)
 
$
870

 
$
9,183

Year ended December 31, 2015:
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
10,017

 
$
692

 
$
411

 
$
10,298


(In thousands)
Balance at
Beginning of
Period
 
Charged to
Costs and
Expenses
 
Write-offs
(Recoveries)
of Doubtful
Accounts
 
Balance at
End of
Period
Year ended December 31, 2017:
 
 
 
 
 
 
 
Allowance for doubtful student notes
$
15,682

 
$
15,917

 
$
10,573

 
$
21,026

Year ended December 31, 2016:
 
 
 
 
 
 
 
Allowance for doubtful student notes
$
8,622

 
$
19,019

 
$
11,959

 
$
15,682

Year ended December 31, 2015:
 
 
 
 
 
 
 
Allowance for doubtful student notes
$
17,603

 
$
12,595

 
$
21,576

 
$
8,622