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Long-Term Debt - 6.750% Senior Unsecured Notes due 2025 (Details) - Senior Notes - 6.750% senior unsecured notes due 2025 - USD ($) | Jun. 30, 2017 | Dec. 31, 2020
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Debt Instrument [Line Items] |  |
Debt instrument, stated rate | 6.75% | 6.75%
Original balance of debt | $ 370,000,000.0 |
Redemption Period One |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 103.375% |
Redemption Period Two |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 101.688% |
Redemption Period Three |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 100.00% |
Redemption Period Four |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 101.00% |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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