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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
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, 2017 |  | $ | 12,252 |  |  | 7,264 |  |  | (2,286 | ) |  | $ | 17,230 |
Year Ended December 31, 2016 |  | $ | 11,175 |  |  | 6,194 |  |  | (5,117 | ) |  | $ | 12,252 |
Year Ended December 31, 2015 |  | $ | 10,424 |  |  | 2,853 |  |  | (2,102 | ) |  | $ | 11,175 |
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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 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 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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- References No definition available. + Details
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