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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Effective tax rate | 24.70% | 24.10% | 24.90%
Increase (decrease) in other deferred liability | $ 22,600 |  |
Net operating loss carryforwards | 74,274 | $ 71,724 |
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowance, amount | 61,089 | 57,790 |
State Tax Net Operating Losses |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowance, amount | $ 51,600 | $ 49,400 |
Percent of deferred tax asset for which valuation allowance has been recognized | 100.00% | 100.00% |
Foreign Tax Net Operating Losses |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowance, amount | $ 9,500 | $ 8,400 |
Percent of deferred tax asset for which valuation allowance has been recognized | 42.00% | 38.00% |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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