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Income Taxes (Components Of Income Tax Provision) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current: U.S. federal |  |  |  |  |  |  |  |  |  |  |  |  | $ (83) | $ (2,110) | $ 10,753
Current: State |  |  |  |  |  |  |  |  |  |  |  |  | 741 | 30 | 169
Current: Foreign |  |  |  |  |  |  |  |  |  |  |  |  | 12,711 | 8,099 | 925
Current: Total |  |  |  |  |  |  |  |  |  |  |  |  | 13,369 | 6,019 | 11,847
Deferred: U.S. federal |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,245) | (5,252)
Deferred: State |  |  |  |  |  |  |  |  |  |  |  |  | 1,097 |  | (225)
Deferred: Foreign |  |  |  |  |  |  |  |  |  |  |  |  | (6,664) | (5,321) | 2,602
Deferred: Total |  |  |  |  |  |  |  |  |  |  |  |  | (5,567) | (6,566) | (2,875)
Total income tax (benefit) provision | $ 971 | $ 3,723 | $ 2,067 | $ 1,041 | $ (1,212) | $ (2,214) | $ 1,700 | $ 1,179 | $ 29,535 | $ (3,524) | $ (10,096) | $ (6,943) | $ 7,802 | $ (547) | $ 8,972

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