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Student Receivables (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Changes in Current and Non-Current Receivables Allowance

Changes in our current and non-current receivables allowance for the years ended December 31, 2017, 2016 and 2015 were as follows (dollars in thousands):

 

 

 

Balance,

Beginning of

Period

 

 

Charges to

Expense (1)

 

 

Amounts

Written-off

 

 

Balance,

End of

Period

 

For the year ended December 31, 2017

 

$

23,142

 

 

$

27,571

 

 

$

(28,179

)

 

$

22,534

 

For the year ended December 31, 2016

 

$

20,229

 

 

$

32,049

 

 

$

(29,136

)

 

$

23,142

 

For the year ended December 31, 2015

 

$

19,097

 

 

$

22,212

 

 

$

(21,080

)

 

$

20,229

 

 

 

(1)

Charges to expense include an offset for recoveries of amounts previously written off of $4.2 million, $6.2 million and $6.7 million for the years ended December 31, 2017, 2016 and 2015, respectively.