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Income Taxes (Schedule Of Reconciliation Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Abstract] |  |  |
Balances as of January 1 | $ 13,114 | $ 14,756 | $ 18,174
Additions related to current year tax positiions | 0 | 0 | 968
Decreases as a result of a lapse of applicable statute of limitations in current year | (5,079) | (1,653) | 0
Additions related to prior year tax positions | 89 | 800 | 0
Decreases related to prior year tax positions | (333) | (789) | (4,386)
Balance as of December 31 | $ 7,791 | $ 13,114 | $ 14,756

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