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Nature Of Business And Summary Of Significant Accounting Policies (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Nature Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Accumulated other comprehensive loss | $ 2,206,235 | $ 2,022,322 | $ 1,557,724 | $ 1,260,665
Unrealized gain on derivatives, tax | 4 | 14 |  |
Foreign currency translation adjustments |  |  |  |
Nature Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Accumulated other comprehensive loss | (163,155) | (77,578) |  |
Unrealized gain on auction rate securities | Auction Rate Securities |  |  |  |
Nature Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Accumulated other comprehensive loss | 232 | 232 |  |
Unrealized gain on derivatives, net of tax of $4 and $14 |  |  |  |
Nature Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Accumulated other comprehensive loss | 27 | 2 |  |
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Nature Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Accumulated other comprehensive loss | $ (162,896) | $ (77,344) | $ (178,583) | $ (181,482)

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