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Schedule II - Valuation and Qualifying Accounts and Reserves
 12 Months Ended
Dec. 31, 2017
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
2017
 
$
14,372

 
$
9,770

 
$
(8,157
)
 
$
15,985

2016
 
$
9,997

 
$
6,797

 
$
(2,422
)
 
$
14,372

2015
 
$
12,455

 
$
430

 
$
(2,888
)
 
$
9,997

 
 
 
 
 
 
 
 
 
Valuation allowance for deferred tax asset
2017
 
$
127,095

 
$
53,782

 
$
(2,721
)
 
$
178,156

2016
 
$
132,624

 
$
6,523

 
$
(12,052
)
 
$
127,095

2015
 
$
116,935

 
$
21,232

 
$
(5,543
)
 
$
132,624