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Other Comprehensive Income (Loss) (Schedule Of Changes In AOCI Balances By Component (After-Tax)) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance at the beginning of the period | $ 1,809,177 |
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX | 1,249 | $ (878)
Balance at the end of the period | 1,812,489 |
Defined Benefit Pension Plan [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance at the beginning of the period | (38,670) | (39,441)
Amounts reclassified from AOCI | 330 | 381
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX | 330 | 381
Balance at the end of the period | (38,340) | (39,060)
Foreign Currency Translation [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance at the beginning of the period | (6,315) | (3,591)
Other comprehensive loss before reclassifications | 246 | (1,174)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX | 246 | (1,174)
Balance at the end of the period | (6,069) | (4,765)
Unrealized Gain (Loss) in Fair Value of Investments, Net [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance at the beginning of the period | (464) | 314
Other comprehensive loss before reclassifications | 665 | (85)
Amounts reclassified from AOCI | 8 |
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX | 673 | (85)
Balance at the end of the period | 209 | 229
Accumulated Other Comprehensive Loss [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance at the beginning of the period | (45,449) | (42,718)
Other comprehensive loss before reclassifications | 911 | (1,259)
Amounts reclassified from AOCI | 338 | 381
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX | 1,249 | (878)
Balance at the end of the period | $ (44,200) | $ (43,596)

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