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Income Taxes (Summary of Income Tax Contingencies) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Abstract] |  |  |
Balance as of January 1 | $ 3,839 | $ 4,304 | $ 3,888
Tax positions related to the current year: |  |  |
Additions | 31 | 208 | 201
Tax positions related to prior years: |  |  |
Additions |  |  | 523
Reductions | (176) | (61) |
Expiration of statutes of limitation | (49) | (612) | (308)
Balance as of December 31 | $ 3,645 | $ 3,839 | $ 4,304

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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=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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