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Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Summary Of Significant Accounting Policies [Abstract] |
Rollforward Analysis of the Allowance Against Accounts Receivable Balance | ﻿
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Year Ended December 31,
﻿Allowances for bad debts |  | 2016 |  | 2015 |  | 2014
﻿ |  | (in thousands)
﻿Balance at January 1 |  | $ | (4,221) |  | $ | (2,400) |  | $ | -
﻿Charged to costs and expenses |  |  | (1,222) |  |  | (2,699) |  |  | (2,400)
﻿Foreign currency gain (loss) |  |  | 232 |  |  | 878 |  |  | -
﻿Balance at December 31 |  | $ | (5,211) |  | $ | (4,221) |  | $ | (2,400)
﻿

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