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Income Taxes Reconciliation of Unrecognized Tax Benefits (Expenses) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Undistributed earnings of its foreign subsidiaries for which the Company has not provided US Deferred income taxes | $ 18,328 |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | 235 |  |  |
Unrecognized Tax Benefits | 1,006 | $ 815 | $ 983 | $ 2,487
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 52 | 0 | 168 |
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation | 43 | (131) | (116) |
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 111 | 293 | 13 |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 0 | (330) | (1,569) |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | $ (15) | $ 0 | $ 0 |

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- Definition Undistributed earnings of its foreign subsidiaries for which the Company has not provided US Deferred income taxes + References No definition available. + Details
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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + 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 foreign currency translation. + 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 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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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + 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)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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