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Long-term Debt - Summary of Debt (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 20, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 62,454,000 | $ 60,495,000 |
Current portion of long-term debt | 1,313,000 | 875,000 |
Total long-term debt | 63,767,000 | 61,370,000 |
Revolving Credit Facility | $150 million revolving line of credit, due January 15, 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 62,454,000 | 0 |
Principal amount of debt | 150,000,000 |  |
Revolving Credit Facility | $100 million revolving line of credit, due December 20, 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 0 | 49,037,000 |
Principal amount of debt | 100,000,000 |  |
Secured Debt | $20 million term loan, due February 1, 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 0 | $ 11,458,000 |
Principal amount of debt | $ 20,000,000 |  | $ 20,000,000

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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