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Organization And Accounting Policies (Rollforward Analysis Of The Allowance Against Accounts Receivable Balance) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Organization And Accounting Policies [Abstract] |  |  |  |
Balance at beginning of period | $ (6,948) | $ (5,874) | $ (7,033) | $ (5,211)
Bad debt recovery (charge) | 159 | 49 | 68 | (232)
Reclassification to leasehold costs related to signing bonus | 4,197 |  | 4,197 |
Reclassification related to Sojitz acquisition |  | (694) |  | (694)
Foreign currency gain (loss) | 11 | (201) | 187 | (583)
Balance at end of period | $ (2,581) | $ (6,720) | $ (2,581) | $ (6,720)

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