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Income Taxes Income Taxes Details 6 (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Beginning Balance | $ 178,326 | $ 182,545 | $ 191,680
Reductions to tax positions related to prior years |  |  | (12,370)
Additions to tax positions related to the current year |  |  | 3,235
Reductions to tax positions as a result of audit settlement | 30,333 |  |
Reductions to tax positions related to prior years | (68,538) | (4,219) |
Ending Balance | 79,455 | 178,326 | 182,545
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 79,500 | 161,800 | 157,200
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 11,100 | 57,300 | 51,600
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | $ 46,200 | $ 5,700 | $ 4,000

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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/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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