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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 presents the changes in the balance of our allowance for doubtful accounts: ໿
Year Ended |  | Item |  | Balance at beginning of year |  | Additions charged to expense |  | Other |  | Balance at end of year
2018 |  | Allowance for doubtful accounts |  | $ | 10,258 |  |  | $ | 1,824 |  |  | $ | (3,659 | ) |  | $ | 8,423 |
2017 |  | Allowance for doubtful accounts |  | 12,920 |  |  | 1,051 |  |  | (3,713 | ) |  | 10,258 |
2016 |  | Allowance for doubtful accounts |  | 14,139 |  |  | 1,552 |  |  | (2,771 | ) |  | 12,920 |

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