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Other Balance Sheet Items (Prepaid Expenses And Other Current Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Balance Sheet Related Disclosures [Abstract] |  |
Income Taxes Receivable | $ 15,328 | $ 23,098
Prepaid expenses | 14,385 | 14,823
Other | 1,671 | 1,935
Other current assets | $ 31,384 | $ 39,856

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