v3.21.2

Long-Term Debt - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |
Interest expense | $ 4,832 | $ 4,830 | $ 9,663 | $ 9,661 |
Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest expense | 4,776 | 4,776 | 9,553 | 9,553 |
Accrued interest | 1,342 |  | 1,342 |  | $ 1,342
Amortization expense, debt issuance costs | $ 56 | $ 54 | $ 110 | $ 108 |
2013 Senior Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption price, percentage |  |  | 100.00% |  |
2016 Senior Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption price, percentage |  |  | 100.00% |  |
Minimum | 2013 Senior Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Prior notice to be given before redemption date |  |  | 30 days |  |
Minimum | 2016 Senior Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Prior notice to be given before redemption date |  |  | 30 days |  |
Maximum | 2013 Senior Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Prior notice to be given before redemption date |  |  | 60 days |  |
Maximum | 2016 Senior Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Prior notice to be given before redemption date |  |  | 60 days |  |

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