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Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Schedule of allowance for doubtful accounts | The following table presents the changes in the allowance for doubtful accounts as of December 31, 2018, 2017 and 2016 (in thousands):
| 2018 |  | 2017 |  | 2016
Allowance for doubtful accounts, beginning balance | $ | 1,577 |  |  | $ | 2,473 |  |  | $ | 2,057 |
Provision for doubtful accounts | 4,940 |  |  | 2,646 |  |  | 3,693 |
Amounts written off | (3,685 | ) |  | (3,542 | ) |  | (3,277 | )
Allowance for doubtful accounts, ending balance | $ | 2,832 |  |  | $ | 1,577 |  |  | $ | 2,473 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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