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Income Taxes (Details 3) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reconciliation of unrecognized tax benefits |  |  |
Balance at January 1 | $ 1,485 | $ 2,653 | $ 2,178
Additions based on positions related to current period | 25 | 367 | 475
Additions based on positions related to prior period | 0 | 0 | 0
Reductions based on positions related to prior period | 0 | (201) | 0
Settlements | 0 | (1,334) | 0
Reductions due to lapse of statute of limitations | 0 | 0 | 0
Balance at December 31 | $ 1,510 | $ 1,485 | $ 2,653

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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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