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Schedule II - Consolidated Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2018
Valuation and Qualifying Accounts [Abstract] |
Schedule II - Consolidated Valuation and Qualifying Accounts | SCHEDULE II - CONSOLIDATED VALUATION AND QUALIFYING ACCOUNTS
(in thousands) |  | Additions |  |
Allowance for doubtful accounts receivable - Year ended December 31, | Balance at beginning of period | Charged to costs and expenses | Transferred from (to) allowance for accounts / notes receivable | (1) Deductions | Balance at end of period
2018 | $ | 9,156 |  | $ | 542 |  | $ | — |  | $ | (1,373 | ) | $ | 8,325 |
2017 | 7,706 |  | 3,000 |  | — |  | (1,550 | ) | 9,156 |
2016 | 6,938 |  | 1,191 |  | — |  | (423 | ) | 7,706 |
(1) Uncollectible accounts written off, net of recoveries and adjustments to estimates for the allowance accounts.

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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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