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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 II - Valuation and Qualifying Accounts | Schedule II—Valuation and Qualifying Accounts (amounts in thousands)
Description |  | Balance At Beginning of Year |  | Additions Charged Against Operations |  | Uncollectible Accounts Written-Off |  | Balance at End of Year
Year ended December 31, 2017 |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 3,723 |  |  | $ | (1,650 | ) |  | $ | (466 | ) |  | $ | 1,607 |
Year ended December 31, 2016 |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 3,037 |  |  | $ | 908 |  |  | $ | (222 | ) |  | $ | 3,723 |
Year ended December 31, 2015 |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 1,847 |  |  | $ | 1,298 |  |  | $ | (108 | ) |  | $ | 3,037 |

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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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