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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Repatriation tax, payment term |  | 8 years |  |
Measurement period adjustments | $ 2,100 |  |  |
Increase in effective tax rate | 0.50% |  |  |
Effective income tax rate | 17.60% | 30.90% | 31.00% |
Decrease in effective income tax rate related to share-based compensation | 4.70% | 7.30% | 0.00% |
Decrease in effective income tax rate from utilization of foreign credits |  | 1.00% |  |
Impact of tax reform on deferred taxes |  | 8.00% |  |
Income taxes paid | $ 69,700 | $ 81,200 | $ 74,700 |
Income tax ruling exemption | 9,200 | 8,900 | 7,800 |
Valuation allowance | (6,212) | (6,211) |  |
Net operating loss carryforwards in certain state and international jurisdictions | 15,100 |  |  |
Unrecognized tax benefits | 24,247 | 21,417 | 18,463 | $ 7,204
Unrecognized tax benefits that would impact effective tax rate if recognized | 18,300 | 9,100 |  |
Interest expense and penalties related to unrecognized tax benefits | 1,200 | 900 | $ 300 |
Interest expense and penalties accrued | $ 2,100 | $ 1,000 |  |
Accounting Standards Update 2016-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Decrease in effective income tax rate related to share-based compensation |  | 7.00% |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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