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Income Taxes (Income Tax Expense Difference) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Tax expense at Federal statutory income tax rate | $ 46,529 | $ 28,798 | $ 23,161
International tax rate differential | (9,603) | (2,260) | (4,792)
Foreign source income, net of tax credits (excluding U.S. tax reform) | 1,087 | 1,215 | 2,449
State tax, net of federal | 279 | (200) | (416)
Unrecognized tax benefits | 2,874 | (5,555) | 148
U.S. tax reform | 13,683 | 0 | 0
Equity compensation excess tax deductions | (3,867) | 0 | 0
General business credits | (1,080) | (1,125) | (908)
Acquisition related expenses | 0 | 0 | 453
Distribution related foreign taxes | 2,173 | 12,433 | 0
Valuation allowance change (excluding U.S. tax reform) | 1,393 | 171 | (1,489)
Other | (1,002) | 520 | 1,247
Total | $ 52,466 | $ 33,997 | $ 19,853

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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