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Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Change in unrecognized tax benefits |  |  |
Balance at beginning of year | $ 8,269 | $ 7,452 | $ 9,152
Additions for tax positions related to current year | 2,154 | 511 | 1,038
Additions for tax positions relating to prior years | 1,721 | 3 | 233
Reductions for tax positions relating to prior years | (934) | (4,877) | (2,826)
Reductions due to the lapse of the applicable statute of limitations | (26) | (122) | (39)
Settlements | (47) | (287) | (106)
Additions for business combination |  | 5,589 |
Balance at end of year | 11,137 | 8,269 | $ 7,452
Unrecognized tax benefits that would impact effective tax rate if recognized | 1,500 |  |
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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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