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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of the beginning and ending balance of unrecognized tax benefits |  |  |  |  |  |
Balance at beginning of year | $ 9,105 | $ 6,844 | $ 7,671 |  |  |
(Decrease) / increase in unrecognized tax benefits as a result of tax positions taken during a prior period |  | 81 | 76 |  |  |
(Decrease) / increase in unrecognized tax benefits as a result of tax positions taken during a prior period | (132) |  |  |  |  |
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations | (543) | (511) | (903) |  |  |
Increases in unrecognized tax benefits as a result of tax positions taken during the current period | 697 | 2,691 |  |  |  |
Balance at end of year | 9,127 | 9,105 | 6,844 |  |  |
Recorded as other long-term liability |  |  |  | $ 676 | $ 1,109 | $ 1,462
Recorded as a decrease in deferred tax assets and offsetting valuation allowance |  |  |  | 8,451 | 7,996 | 5,382
Unrecognized tax benefits | $ 9,105 | $ 6,844 | $ 7,671 | $ 9,127 | $ 9,105 | $ 6,844

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- Definition The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns, recorded as a decrease in deferred tax assets and offsetting valuation allowance, as of the balance sheet date. + References No definition available. + Details
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- Definition The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns, recorded as other long-term liability, as of the balance sheet date. + References No definition available. + Details
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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=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + 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)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + 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)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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