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Line of Credit (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jun. 13, 2016 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Line of Credit Facility [Line Items] |  |  |  |
Letters of credit outstanding amount |  | $ 4,630,000 |  |
Revolving Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, term | 5 years |  |  |
Credit facility maximum borrowing capacity |  | $ 300,000,000 |  |
Credit facility stated percentage |  | 0.00% |  |
Credit facility accordion feature, increase limit |  | $ 100,000,000 |  |
Credit facility remaining borrowing capacity |  | 295,370,000 |  |
Credit facility commitment fees |  | $ 609,000 | $ 630,000 | $ 645,000
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility variable interest rate basis spread (as a percent) |  | 1.00% |  |
Revolving Credit Facility | Federal Funds Rate |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility variable interest rate basis spread (as a percent) |  | 0.50% |  |
Letter of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility maximum borrowing capacity |  | $ 15,000,000 |  |
Credit facility, commitment fee percentage |  | 1.25% |  |
Credit facility, fronting fee percentage |  | 0.175% |  |
Minimum | Revolving Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility commitment fee per annum on daily unused portion (as a percent) |  | 0.15% |  |
Minimum | Revolving Credit Facility | Base Rate |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility variable interest rate basis spread (as a percent) |  | 0.25% |  |
Minimum | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility variable interest rate basis spread (as a percent) |  | 1.25% |  |
Maximum | Revolving Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility commitment fee per annum on daily unused portion (as a percent) |  | 0.30% |  |
Maximum | Revolving Credit Facility | Base Rate |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility variable interest rate basis spread (as a percent) |  | 1.00% |  |
Maximum | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility variable interest rate basis spread (as a percent) |  | 2.00% |  |

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- Definition Line Of Credit Facility, Fronting Fee Percentage + References No definition available. + Details
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- Definition Line of Credit Facility, Conditional Increase (Decrease), Net + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Amount of the fee for available but unused credit capacity under the credit facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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