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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Significant Accounting Policies [Abstract] |
Schedule Of Allowance For Doubtful Accounts |
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﻿Year Ended |  | Item |  | Balance at beginning of year |  | Additions charged to expense |  | Other |  | Balance at end of year
﻿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
﻿2015 |  | Allowance for doubtful accounts |  |  | 10,300 |  |  | 3,766 |  |  | 73 |  |  | 14,139
﻿

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- Definition Schedule Of Allowance For Doubtful Accounts [Table Text Block] + References No definition available. + Details
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- References No definition available. + Details
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