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Schedule II - Valuation and Qualifying Accounts and Reserves (Notes)
 12 Months Ended
Dec. 31, 2015
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
2015
 
$
10,742

 
$
1,408

 
$
(2,888
)
 
$
9,262

2014
 
$
13,149

 
$
2,041

 
$
(4,448
)
 
$
10,742

2013
 
$
20,219

 
$
3,881

 
$
(10,951
)
 
$
13,149

 
 
 
 
 
 
 
 
 
Valuation allowance for deferred tax asset
2015
 
$
116,935

 
$
21,232

 
$
(5,543
)
 
$
132,624

2014
 
$
122,780

 
$
636

 
$
(6,481
)
 
$
116,935

2013
 
$
142,176

 
$
15,921

 
$
(35,317
)
 
$
122,780