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SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS
12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II. VALUTAION AND QUALIFYING ACCOUNTS
SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS
Allowance for Doubtful Accounts
The transactions in the allowance for doubtful accounts for the years ended December 31, were as follows (in thousands): 
 
2017
 
2016
 
2015
Balance, beginning of year
$
39,543

 
$
43,455

 
$
41,051

Provision
13,489

 
5,136

 
11,538

Write-offs
(10,623
)
 
(9,048
)
 
(9,134
)
Balance, end of year
$
42,409

 
$
39,543

 
$
43,455









INDEX TO EXHIBITS
 
 
 
Number
  
Description
2.1
 
 
 
 
2.2
 
 
 
 
3.1
  
 
 
3.2
  
 
 
4.1
  
 
 
†10.1
 
 
 
 
†10.2
  
 
 
10.3
 
 
 
 
10.4
 
 
 
10.5
 
 
 
 
10.6
 
 
 
 
10.7
 
 
 
 
10.8
 
 
 
 
10.9
 
 
 
 
10.10
 
 
 
 
10.11
 
 
 
 
†10.12
  
 
 
†10.13
  
 
 
†10.14
  
 
  
 
Number
  
Description
 
 
 
†10.15
  
 
 
†10.16
  
 
 
 
†10.17
  
 
 
 
†10.18
 
 
 
 
†10.19
 
 
 
 
†10.20
 
 
 
 
†10.21
 
 
 
 
†10.22
 
 
 
†10.23
 
 
 
 
†10.24
 
 
 
 
†10.25
 
 
 
 
*21
  
 
 
*23.1
  
 
 
*24
  
 
 
 
*31.1
  
 
 
*31.2
  
 
 
*32.1
  
 
 
*32.2
  
 
 
*101
  
The following financial statements from our Annual Report on Form 10-K for the year ended December 31, 2017, filed on February 28, 2018, formatted in XBRL: (i) Consolidated Statement of Operations and Comprehensive Income for the years ended December 31, 2017, 2016, and 2015, (ii) Consolidated Balance Sheets as of December 31, 2017 and 2016, (iii) Consolidated Statements of Cash Flows for the years ended December 31, 2017 and 2016, (iv) Consolidated Statements of Stockholders’ Investment for the years ended 2017, 2016, and 2015, and (v) the Notes to the Consolidated Financial Statements, tagged as blocks of text

*
Filed herewith
Management contract or compensatory plan or arrangement required to be filed as an exhibit to Form 10-K pursuant to Item 15(c) of the Form 10-K Report