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SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II. VALUTAION AND QUALIFYING ACCOUNTS
SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS
Allowance for Doubtful Accounts
The transactions in the allowance for doubtful accounts for the years ended December 31 were as follows (in thousands): 
 
2016
 
2015
 
2014
Balance, beginning of year
$
43,455

 
$
41,051

 
$
39,292

Provision
5,136

 
11,538

 
15,092

Write-offs
(9,048
)
 
(9,134
)
 
(13,333
)
Balance, end of year
$
39,543

 
$
43,455

 
$
41,051