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Income Tax (Reconciliation of the Amount of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Unrecognized Tax Benefits, Increase Resulting from Acquisition | $ 521 | $ 0 | $ 0
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized Tax Benefits Beginning balance, January 1 | 321,224 | 297,290 | 296,213
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions | 255,970 | 247,596 | 226,720
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions | (256,587) | (246,894) | (229,719)
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions | 3,682 | 36,438 | 4,186
Unrecognized Tax Benefits, Payment On Deposit | (185) | 0 | 0
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 0 | (13,206) | (110)
Unrecognized Tax Benefits Ending balance, December 31 | $ 324,625 | $ 321,224 | $ 297,290

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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