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Allowance for Doubtful Accounts (Tables) | 12 Months Ended
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Dec. 31, 2017
Receivables [Abstract] |
Allowance for Doubtful Debts | In order to provide for these collection problems and the general risk associated with the granting of credit terms, the Company recorded the following bad debt provisions (in an Allowance for Doubtful Accounts):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Bad debt provision | $ | 6,250 |  |  | $ | 4,629 |  |  | $ | 4,335 |
Impaired Notes Receivable | Summary schedules of impaired notes receivable, and the related reserve, for the years ended December 31, 2017, 2016 and 2015 are as follows:
|  | Impaired Notes Receivable
Year Ended December 31, |  | Balance Beginning of Year |  | Additions |  | Deductions |  | Balance End of Year |  | Average Outstanding Balance
|  | (in thousands)
2017 |  | $ | 5,685 |  |  | $ | 1,169 |  |  | $ | — |  |  | $ | 6,854 |  |  | $ | 6,270 |
2016 |  | $ | 6,471 |  |  | $ | — |  |  | $ | 786 |  |  | $ | 5,685 |  |  | $ | 6,078 |
2015 |  | $ | 10,208 |  |  | $ | 395 |  |  | $ | 4,132 |  |  | $ | 6,471 |  |  | $ | 8,340 |
|  | Reserve for Impaired Notes Receivable
Year Ended December 31, |  | Balance Beginning of Year |  | Additions |  | Deductions |  | Balance End of Year
|  | (in thousands)
2017 |  | $ | 2,419 |  |  | $ | 465 |  |  | $ | — |  |  | $ | 2,884 |
2016 |  | $ | 2,139 |  |  | $ | 280 |  |  | $ | — |  |  | $ | 2,419 |
2015 |  | $ | 3,031 |  |  | $ | 99 |  |  | $ | 991 |  |  | $ | 2,139 |

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- Definition Schedule Of Bad Debt Expense [Table Text Block] + References No definition available. + Details
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- Definition Schedule of Impaired Financing Receivable [Table Text Block] + References No definition available. + Details
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