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Long-Term Obligations - 6.75% Senior Notes Due 2025 (Details) - Senior Notes [Member] - Senior 2025 Notes [Member] - USD ($) | May 23, 2017 | Sep. 30, 2017
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Debt Instrument [Line Items] |  |
Face amount of debt | $ 250,000,000.0 |
Interest rate (as percent) | 6.75% |
Principal outstanding |  | $ 250,000,000
Deferred financing costs |  | 5,700,000
Debt discount |  | $ 1,800,000
Anytime prior to May 15, 2020 |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage of principal amount redeemed (as percent) | 35.00% |
Redemption price (as percent) | 106.75% |
Twelve-month period beginning on May 15, 2020 |  |
Debt Instrument [Line Items] |  |
Redemption price (as percent) | 105.063% |
Twelve-month period beginning on May 15, 2021 |  |
Debt Instrument [Line Items] |  |
Redemption price (as percent) | 103.375% |
Twelve-month period beginning on May 15, 2022 |  |
Debt Instrument [Line Items] |  |
Redemption price (as percent) | 101.688% |
Beginning on May 15, 2023 and thereafter |  |
Debt Instrument [Line Items] |  |
Redemption price (as percent) | 100.00% |

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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/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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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