Quarterly report pursuant to Section 13 or 15(d)

Organization And Accounting Policies (Rollforward Analysis Of The Allowance Against Accounts Receivable Balance) (Details)

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Organization And Accounting Policies (Rollforward Analysis Of The Allowance Against Accounts Receivable Balance) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Organization And Accounting Policies [Abstract]        
Balance at beginning of period $ (7,164) $ (5,399) $ (7,033) $ (5,211)
Charge to costs and expenses (145) (183) (89) (281)
Foreign currency gain (loss) 361 (292) 174 (382)
Balance at end of period $ (6,948) $ (5,874) $ (6,948) $ (5,874)