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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Valuation and Qualifying Accounts Disclosure [Table Text Block]
 
 
Balance at Beginning of Year
 
Provision
 
Recoveries
 
Charge-offs
 
Balance at End of Year
Year ended December 31, 2016
 
$
11,464
 
 
$
21,583
 
 
$
108
 
 
$
(22,383
)
 
$
10,772
 
Year ended December 31, 2017
 
 
10,772
 
 
 
20,233
 
 
 
-
 
 
 
(16,206
)
 
 
14,799
 
Year ended December 31, 2018
 
 
14,799
 
 
 
20,453
 
 
 
-
 
 
 
(21,569
)
 
 
13,683
 
 
 
Balance at Beginning of Year
 
Provision
 
Appeals found in providers favor
 
Release of estimated liability
 
Balance at End of Year
 Year ended December 31, 2016
 
$
12,801
 
 
$
721
 
 
$
(2,396
)
 
$
-
 
 
$
11,126
 
 Year ended December 31, 2017
 
 
11,126
 
 
 
83
 
 
 
(2,665
)
 
 
-
 
 
 
8,544
 
 Year ended December 31, 2018
 
 
8,544
 
 
 
-
 
 
 
(108
)
 
 
(8,436
)
 
 
-