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Borrowings - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Unamortized debt premium, net | $ (1,535) | $ (1,482)
Debt issuance costs | 14,509 | 15,514
Total debt, net | 1,336,483 | 1,331,878
Senior Notes |  |
Debt Instrument [Line Items] |  |
Unamortized debt premium, net | (2,260) | (2,362)
Debt issuance costs | 13,314 | 14,063
Total debt, net | $ 1,208,173 | $ 1,207,526
Senior Notes | 5 3/4% Senior Notes Maturing June 2019 |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt instrument (percent) | 5.75% | 5.75%
Total debt, net | $ 321,393 | $ 321,393
Senior Notes | 7 1/2% Senior Notes Maturing September 2021 |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt instrument (percent) | 7.50% | 7.50%
Total debt, net | $ 198,000 | $ 198,000
Senior Notes | 8 3/4% Senior Notes Maturing March 2022 |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt instrument (percent) | 8.75% | 8.75%
Total debt, net | $ 500,000 | $ 500,000
Senior Notes | 7 1/4% Senior Notes Maturing February 2023 |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt instrument (percent) | 7.25% | 7.25%
Total debt, net | $ 199,834 | $ 199,834
Term Loan |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt instrument (percent) | 6.75% |
Total debt, net | $ 53,080 | 52,669
Junior Subordinated Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt instrument (percent) | 7.987% |
Total debt, net | $ 60,387 | 59,870
Other Secured Notes payable |  |
Debt Instrument [Line Items] |  |
Total debt, net | $ 14,843 | $ 11,813

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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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