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SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2015
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):
| 2015 |  | 2014 |  | 2013
Balance, beginning of year | $ | 41,051 |  |  | $ | 39,292 |  |  | $ | 34,560 |
Provision | 11,538 |  |  | 15,092 |  |  | 15,587 |
Write-offs | (9,134 | ) |  | (13,333 | ) |  | (10,855 | )
Balance, end of year | $ | 43,455 |  |  | $ | 41,051 |  |  | $ | 39,292 |

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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