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Long-Term Debt - Additional Information (Narrative) (Details) - USD ($) |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 28, 2020 | Aug. 25, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Sep. 22, 2020 | Jun. 23, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost | $ 2,500,000 | $ 1,700,000 |  |  |  |  |
Write-off of debt issuance costs | 341,200 | 200,000 | $ 0 | $ 4,000 |  |  |
Debt Instrument, Repurchase Amount | 1,400,000 |  |  | 1,400,000 |  |  |
Gain (Loss) on Repurchase of Debt Instrument |  |  | 0 | 85,560 |  |  |
Debt Instrument, Increase, Accrued Interest |  | 1,900,000 |  |  |  |  |
Debt Issuance Costs, Gross |  |  |  |  |  | $ 3,100,000 |
Long-term debt |  |  | 123,886,000 |  | $ 123,846,000 |  |
Repayments of Secured Debt |  | $ 50,000,000.0 |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 25.00% |  |  |  |  |
Debt Issuance Cost, Amount paid to Subsidiary |  |  |  |  |  | 1,900,000 |
Debt Issuance Costs, Net |  |  |  |  |  | 1,200,000 |
6.75% Senior Secured Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross | 150,000,000.0 |  |  |  |  |  |
Long Term Debt, Amount held in Treasury | 1,400,000 |  |  |  |  |  |
Interest Expense, Debt |  |  |  | $ 2,500,000 |  |  |
Long Term Debt, Net Amount Outstanding | $ 148,600,000 |  |  |  |  |  |
6.75% Senior Secured Notes [Member] | Senior Secured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 200,000,000.0
Interest rate |  |  |  |  |  |  | 6.75%
5.50% Senior Secured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | 125,000,000 |  | $ 125,000,000 |  |
Interest Expense, Debt |  |  | $ 1,700,000 |  |  |  |
5.50% Senior Secured Notes | Senior Secured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 125,000,000.0 |
Interest rate |  |  |  |  |  | 5.50% |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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)(1) -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(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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: 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 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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