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Debt and Credit Facility - Additional Information (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 18, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | May 01, 2020 | Apr. 28, 2020 | Dec. 31, 2019 | Nov. 26, 2019 | May 15, 2016
Debt Instrument |  |  |  |  |  |  |  |  |  |
Interest expense capitalized |  | $ 300,000 | $ 400,000 | $ 800,000 | $ 1,300,000 |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 375,000,000.0 |  | 375,000,000.0 |  |  |  |  |  |
Senior Notes Due 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Debt instrument contractual rate (percent) |  |  |  |  |  | 6.50% | 6.50% |  |  |
Debt issuance, percentage of principal amount |  |  |  |  |  | 101.00% | 100.00% |  |  |
Debt principal amount |  | 350,000,000.0 |  | 350,000,000.0 |  | $ 50,000,000.0 | $ 300,000,000.0 |  |  |
Unamortized debt issuance costs |  | 5,600,000 |  | 5,600,000 |  |  |  |  |  |
Interest expense |  | $ 6,000,000.0 |  | $ 10,200,000 |  |  |  |  |  |
Effective interest rate (percent) |  | 6.80% |  | 6.80% |  |  |  |  |  |
Debt instrument, payment terms |  |  |  | Interest accrues on the 6.50% Senior Notes beginning April 28, 2020 at a rate of 6.50% per annum and is payable semiannually on May 1 and November 1 of each year. The first interest payment date is November 1, 2020 |  |  |  |  |  |
Debt instrument, frequency of interest payment |  |  |  | semiannually |  |  |  |  |  |
Debt Instrument, first interest payment date |  |  |  | Nov. 01, 2020 |  |  |  |  |  |
Fair value of outstanding debt |  | $ 361,500,000 |  | $ 361,500,000 |  |  |  |  |  |
Senior Notes Due 2025 | Senior Notes | On or After May 1, 2022 |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principal (percent) |  |  |  | 103.25% |  |  |  |  |  |
Senior Notes Due 2025 | Senior Notes | On or After May 1, 2023 |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principal (percent) |  |  |  | 101.625% |  |  |  |  |  |
Senior Notes Due 2025 | Senior Notes | On or After May 1, 2024 |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principal (percent) |  |  |  | 100.00% |  |  |  |  |  |
Senior Notes Due 2025 | Senior Notes | Prior to May 1, 2022 |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principal (percent) |  |  |  | 106.50% |  |  |  |  |  |
Percentage of principal that can be redeemed (percent) |  |  |  | 40.00% |  |  |  |  |  |
Senior Notes Due 2028 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Debt instrument contractual rate (percent) |  |  |  |  |  |  |  |  | 4.625% |
Debt issuance, percentage of principal amount |  |  |  |  |  |  |  |  | 100.00% |
Debt principal amount |  |  |  |  |  |  |  |  | $ 500,000,000.0 |
Unamortized debt issuance costs |  | 6,700,000 |  | $ 6,700,000 |  |  |  |  |  |
Interest expense |  | $ 6,000,000.0 |  | $ 18,000,000.0 |  |  |  |  |  |
Effective interest rate (percent) |  | 4.80% |  | 4.80% |  |  |  |  |  |
Fair value of outstanding debt |  | $ 468,300,000 |  | $ 468,300,000 |  |  |  | $ 513,500,000 |  |
Senior Notes Due 2024 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Debt instrument contractual rate (percent) |  |  |  |  |  |  |  |  |  | 5.875%
Debt issuance, percentage of principal amount |  |  |  |  |  |  |  |  |  | 100.00%
Debt principal amount |  |  |  |  |  |  |  |  |  | $ 375,000,000.0
Interest expense |  |  | $ 5,700,000 |  | $ 17,100,000 |  |  |  |  |
Effective interest rate (percent) |  |  | 6.10% |  | 6.10% |  |  |  |  |
Redemption price as percentage of principal (percent) | 104.406% |  |  |  |  |  |  |  |  |

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