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Allowance for Doubtful Accounts (Tables) | 12 Months Ended
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Dec. 31, 2015
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, we have recorded the following bad debt provisions (in an Allowance for Doubtful Accounts):
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Bad debt provision | $ | 4,335,000 |  |  | $ | 4,470,000 |  |  | $ | 1,990,000 |
Impaired Notes Receivable | Summary schedules of impaired notes receivable, and the related reserve, for the years ended December 31, 2015, 2014 and 2013 are as follows:
| Impaired Notes Receivable
Year ended December 31, | Balance Beginning of Year |  | Additions |  | Deductions |  | Balance End of Year |  | Average Outstanding Balance
2015 | $ | 10,208,000 |  |  | $ | 395,000 |  |  | $ | 4,132,000 |  |  | $ | 6,471,000 |  |  | $ | 8,340,000 |
2014 | $ | 2,892,000 |  |  | $ | 9,124,000 |  |  | $ | 1,808,000 |  |  | $ | 10,208,000 |  |  | $ | 6,550,000 |
2013 | $ | 1,639,000 |  |  | $ | 1,267,000 |  |  | $ | 14,000 |  |  | $ | 2,892,000 |  |  | $ | 2,266,000 |
Reserve for Impaired Notes Receivable |
| Reserve for Impaired Notes Receivable
Year ended December 31, | Balance Beginning of Year |  | Additions |  | Deductions |  | Balance End of Year
2015 | $ | 3,031,000 |  |  | $ | 99,000 |  |  | $ | 991,000 |  |  | $ | 2,139,000 |
2014 | $ | 2,019,000 |  |  | $ | 2,489,000 |  |  | $ | 1,477,000 |  |  | $ | 3,031,000 |
2013 | $ | 958,000 |  |  | $ | 1,072,000 |  |  | $ | 11,000 |  |  | $ | 2,019,000 |

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- Definition Schedule of Financing Receivable, Allowance for Credit Losses [Table Text Block] + References No definition available. + Details
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