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Borrowings - Schedule of Long-term Debt (Details) - USD ($) | Dec. 31, 2018 | Sep. 30, 2018 | Jul. 30, 2016
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Unamortized debt premium, net | $ 2,447,000 | $ 2,640,000 |
Unamortized debt issuance costs | (13,651,000) | (14,336,000) |
Total debt, net | 1,255,784,000 | 1,231,254,000 |
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized debt premium, net | 2,447,000 | 2,640,000 |
Unamortized debt issuance costs | (13,651,000) | (14,336,000) |
Total debt, net | $ 1,163,630,000 | 1,163,138,000 |
Senior Notes | 8 3/4% Senior Notes Maturing March 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) | 8.75% |  |
Total debt, net | $ 500,000,000 | 500,000,000 |
Senior Notes | 7 1/4% Senior Notes Maturing February 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) | 7.25% |  |
Total debt, net | $ 24,834,000 | 24,834,000 |
Senior Notes | 6 3/4% Senior Notes Maturing March of 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) | 6.75% |  |
Total debt, net | $ 250,000,000 | 250,000,000 |
Senior Notes | 5 7/8% Senior Notes Maturing October 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) | 5.875% |  |
Total debt, net | $ 400,000,000 | 400,000,000 |
Junior Subordinated Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) |  |  | 7.987%
Total debt, net | 64,520,000 | 64,003,000 |
Other Secured Notes payable |  |  |
Debt Instrument [Line Items] |  |  |
Total debt, net | 2,634,000 | 4,113,000 |
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Revolving Credit Facility | $ 25,000,000 | $ 0 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount, after accumulated amortization, of debt discount (premium). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28567-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 + Details
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