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Schedule II - Valuation and Qualifying Accounts and Reserves
 12 Months Ended
Dec. 31, 2019
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
2019
 
$
17,443

 
$
16,345

 
$
(15,958
)
 
$
17,830

2018
 
$
14,319

 
$
9,770

 
$
(6,646
)
 
$
17,443

2017
 
$
13,506

 
$
7,426

 
$
(6,613
)
 
$
14,319

 
 
 
 
 
 
 
 
 
Valuation allowance for deferred tax asset
2019
 
$
142,496

 
$
5,324

 
$
(37,038
)
 
$
110,782

2018
 
$
178,156

 
$
3,682

 
$
(39,342
)
 
$
142,496

2017
 
$
127,095

 
$
53,782

 
$
(2,721
)
 
$
178,156