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Income Taxes Operating Loss Carryforwards (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating loss carryforwards [Abstract] |  |  |
Share-based Payment Arrangement, Exercise of Option, Tax Benefit | $ 9,653 | $ 12,617 | $ 20,004
UNITED STATES |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating Loss Carryforwards | 14,800 |  |
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating Loss Carryforwards | 1,400 |  |
Foreign Tax Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating Loss Carryforwards | $ 18,400 |  |

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- Definition Amount of tax benefit from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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