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Leases - Narrative (Details) - USD ($) | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | --- | --- | ---
Operating Lease, Right-of-Use Asset | $ 18,011,000 |  |  | $ 13,714,000 |  |  |  |
Operating Lease, Liability | $ 19,127,000 |  |  | $ 14,482,000 |  |  |  |
Operating Lease, Weighted Average Remaining Lease Term | 7 years 8 months 12 days |  |  | 7 years 2 months 12 days |  |  |  |
Operating Lease, Weighted Average Discount Rate, Percent | 2.40% |  |  | 3.10% |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 1,016,996,000 |  |  | $ 969,014,000 |  |  |  |
Deferred Rent Credit |  |  |  |  |  |  |  | $ 600,000
Other Assets [Member] |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset | 18,000,000.0 |  |  | 13,700,000 |  |  |  | 11,000,000.0
Other Liabilities [Member] |  |  |  |  |  |  |  |
Operating Lease, Liability | 19,127,000 |  |  | 14,500,000 |  |  |  | 11,800,000
Retained Earnings [Member] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 676,465,000 | $ 662,311,000 | $ 649,636,000 | $ 646,847,000 | $ 639,594,000 | $ 625,227,000 | $ 619,971,000 | 614,069,000
Accounting Standards Update 2016-02 [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  | 613,926,000
Accounting Standards Update 2016-02 [Member] | Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  | $ (143,000)

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- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121549951&loc=d3e39896-112707 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Weighted average discount rate for operating lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. 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