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Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Summary Of Significant Accounting Policies [Abstract] |
Rollforward Analysis of the Allowance Against Accounts Receivable Balance |
|  | Year Ended December 31,
Allowances for bad debts |  | 2015 |  | 2014 |  | 2013
|  | (in thousands)
Balance at January 1 |  | $ | (10,031) |  | $ | (7,631) |  | $ | (6,069)
Charged to costs and expenses |  |  | (2,699) |  |  | (2,400) |  |  | (1,562)
Foreign currency gain |  |  | 880 |  |  | - |  |  | -
Balance at December 31 |  | $ | (11,850) |  | $ | (10,031) |  | $ | (7,631)

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