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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 of Valuation and Qualifying Accounts Disclosure |
Description |  | Balance at Beginning of Year |  | Costs and Expenses |  | Deductions (1) |  | Balance at End of Year
Allowance for doubtful accounts |  |  |  |  |  |  |  |
Year Ended December 31, 2018 |  | $ | 17,230 |  |  | 2,123 |  |  | (3,992 | ) |  | $ | 15,361 |
Year Ended December 31, 2017 |  | $ | 12,252 |  |  | 7,264 |  |  | (2,286 | ) |  | $ | 17,230 |
Year Ended December 31, 2016 |  | $ | 11,175 |  |  | 6,194 |  |  | (5,117 | ) |  | $ | 12,252 |
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(1) | Deductions primarily represent uncollectible balances of accounts receivable written off, net of recoveries.

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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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