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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS | SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS
|  | Balance at beginning of year |  | Acquisitions |  | Amounts charged to income |  | Amounts written off |  | Balance at end of year
Description |  |  |  |  |
|  | (in thousands)
Allowance for uncollectible accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2018 |  | $ | 218,399 |  |  | $ | — |  |  | $ | 42,287 |  |  | $ | 207,762 |  |  | $ | 52,924 |
Year ended December 31, 2017 |  | $ | 238,897 |  |  | $ | — |  |  | $ | 478,365 |  |  | $ | 498,863 |  |  | $ | 218,399 |
Year ended December 31, 2016 |  | $ | 251,734 |  |  | $ | — |  |  | $ | 442,985 |  |  | $ | 455,822 |  |  | $ | 238,897 |

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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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- References No definition available. + Details
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