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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Allowance for Doubtful Accounts | The following table sets forth our allowance for doubtful accounts (in thousands):
Allowance for doubtful accounts receivable |
January 1, 2015 |  | $ | 2,661 |
Charged to costs and expenses |  |  | 919 |
Charged to other accounts (1) |  |  | 533 |
Deductions (2) |  |  | (1,627 | )
December 31, 2015 |  | $ | 2,486 |
Charged to costs and expenses |  |  | 2,928 |
Charged to other accounts (1) |  |  | 435 |
Deductions (2) |  |  | (2,452 | )
December 31, 2016 |  | $ | 3,397 |
Charged to costs and expenses |  |  | 2,834 |
Charged to other accounts (1) |  |  | 699 |
Deductions (2) |  |  | (2,125 | )
December 31, 2017 |  | $ | 4,805 |
(1) | Recovery of receivables previously written off as bad debt and other
(2) | Write-off of uncollectible accounts receivable

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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