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Income Taxes (Reconciliation Of Effective Tax Rate) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Tax at statutory rate | $ (112,223) | $ (193,155) | $ (128,298)
Non-U.S. rate differential — net | (26,985) | 25,795 | 16,718
State income taxes — net | (3,367) | (3,413) | (2,640)
Stock-based compensation - tax benefit | 13,298 | 14,015 | 0
Foreign derived intangible income benefit | 7,930 | 0 | 0
Global intangible low-taxed income taxed in the U.S. | (5,955) | 0 | 0
Effect of 2017 U.S. Tax Cuts and Jobs Act | 4,747 | (48,126) | 0
Effect of changes in enacted tax rates on deferred tax assets and liabilities | (1,422) | (1,281) | (111)
Effect of changes in enacted tax rates on prepaid taxes | (6,585) | 0 | 0
Federal and state tax credits | 11,024 | 9,210 | 9,840
Change in reserves, including interest and penalties | (2,290) | (4,350) | 1,105
Change in valuation allowance | (7,421) | 51 | 26
Other — net | (977) | (3,029) | (2,489)
Provision for income taxes | $ (130,226) | $ (204,283) | $ (105,849)

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax benefit for share-based compensation cost. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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