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SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2019
SEC Schedule, 12-09, 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):
| 2019 |  | 2018 |  | 2017 |  |
Balance, beginning of year | $ | 41,131 |  |  | $ | 42,409 |  |  | $ | 39,543 |  |  |
Provision | 5,853 |  |  | 15,634 |  |  | 13,489 |  |  |
Write-offs | (14,146) |  |  | (16,912) |  |  | (10,623) |  |  |
Balance, end of year | $ | 32,838 |  |  | $ | 41,131 |  |  | $ | 42,409 |  |  |
(b) Index to Exhibits-Any document incorporated by reference is identified by a parenthetical referencing the SEC filing which included the document. We will furnish a copy of any Exhibit at no cost to a security holder upon request.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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