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Long-Term Debt - Additional Information (Narrative) (Details) - USD ($) |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 25, 2019 | Jun. 23, 2017 | Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Sep. 19, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost | $ 1,700,000 |  |  |  |  |  |
Write-off of debt issuance costs |  |  | $ 4,000 | $ 200,000 | $ 0 |  |
Debt Instrument, Repurchase Amount |  |  | 1,400,000 |  |  |  |
Debt Instrument, Payment of Interest |  |  | 22,807 |  |  |  |
Gain (Loss) on Repurchase of Debt Instrument |  |  | 85,560 |  | 0 |  |
Long-term Debt, Gross |  |  | 148,574,000 |  |  | $ 150,000,000 |
Debt Instrument, Increase, Accrued Interest |  |  | 1,900,000 |  |  |  |
Long-term debt |  |  | 148,142,000 |  |  | $ 149,515,000 |
Repayments of Secured Debt | $ 50,000,000 |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 25.00% |  |  |  |  |  |
6.75% Senior Secured Notes [Member] | Senior Secured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Private placement date |  | Jun. 23, 2017 |  |  |  |  |
Debt Instrument, Face Amount |  | $ 200,000,000 |  |  |  |  |
Interest rate |  | 6.75% |  |  |  |  |
Debt Issuance Costs, Gross |  | $ 4,300,000 |  |  |  |  |
Interest expense on note |  |  | 2,500,000 |  | $ 3,400,000 |  |
Debt Instrument, Issue Price Percentage |  | 100.00% |  |  |  |  |
Percentage of Notes Registered under the Securities Act of 1933 |  |  |  |  |  |  | 99.80%
8.75% Senior Secured Notes [Member] | Senior Secured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  | 8.75% |  |  |  |  |
Extinguishment of Debt, Amount |  | $ 120,000,000 |  |  |  |  |
Oppenheimer [Member] | 6.75% Senior Secured Notes [Member] | Senior Secured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Issuance Costs, Gross |  | 3,000,000 |  |  |  |  |
Third Party [Member] | 6.75% Senior Secured Notes [Member] | Senior Secured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Issuance Costs, Gross |  | $ 1,300,000 |  |  |  |  |
Maximum [Member] | 6.75% Senior Secured Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Restrictive Covenants Exception for Dividend or Distribution Amount during fiscal year |  |  | 20,000,000 |  |  |  |
Restrictive Covenants Exception for total Dividend Payment and other Restricted Payments |  |  | $ 10,000,000 |  |  |  |

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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=109500613&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=119400593&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=6877327&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=6876686&loc=d3e534808-122878 + Details
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