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Schedule II - Valuation and Qualifying Accounts and Reserves
 12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts and Reserves
Description
 
Balance at beginning of year
 
Additions charged to expense
 
Deductions
 
Balance at end of year
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
2018
 
$
14,786

 
$
9,720

 
$
(6,889
)
 
$
17,617

2017
 
$
13,999

 
$
8,081

 
$
(7,294
)
 
$
14,786

2016
 
$
11,541

 
$
7,179

 
$
(4,721
)
 
$
13,999

 
 
 
 
 
 
 
 
 
Valuation allowance for deferred tax asset
2018
 
$
178,156

 
$
3,682

 
$
(39,342
)
 
$
142,496

2017
 
$
127,095

 
$
53,782

 
$
(2,721
)
 
$
178,156

2016
 
$
132,624

 
$
6,523

 
$
(12,052
)
 
$
127,095