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Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Change in unrecognized tax benefits |  |  |
Balance at beginning of year | $ 7,452 | $ 9,152 | $ 4,276
Additions for tax positions related to current year | 511 | 1,038 | 5,596
Additions for tax positions relating to prior years | 3 | 233 | 143
Reductions for tax positions relating to prior years | (4,877) | (2,826) |
Reductions due to the lapse of the statute of limitations | (122) | (39) | (642)
Settlements | (287) | (106) | (221)
Additions for business combination | 5,589 |  |
Balance at end of year | 8,269 | 7,452 | $ 9,152
Unrecognized tax benefits that would impact effective tax rate if recognized | 600 |  |
Accrued interest and penalties related to unrecognized tax benefits | $ 300 | $ 300 |

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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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