Long-Term Debt - Senior Unsecured Notes (Details) - USD ($)
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3 Months Ended |
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May 22, 2020 |
Mar. 15, 2019 |
Nov. 30, 2017 |
Mar. 31, 2021 |
Dec. 31, 2020 |
| Debt Instrument [Line Items] |
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| Redemption price percentage |
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100.00%
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| Senior Notes |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Unamortized Discount |
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$ 20,557,000
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$ 21,458,000
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| Debt Conversion, Original Debt, Amount |
$ 254,200,000
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| Percentage of principal amount, eligible to be redeemed |
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35.00%
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| Redemption price percentage |
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100.00%
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| Percentage of principal amount, redeemable |
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65.00%
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| Debt Instrument, Redemption Period, Maximum Period Within Closing Of Offering |
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180 days
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| Senior Notes Due 2027 | Senior Notes |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
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$ 500,000,000.0
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$ 356,351,000
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$ 356,351,000
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| Interest rate, stated percentage |
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6.875%
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6.875%
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6.875%
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| Private placement price as percentage of par |
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99.235%
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| Proceeds from borrowings, net of issuance costs |
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$ 489,000,000.0
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| Debt Instrument, Unamortized Discount |
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3,800,000
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| Debt issuance costs |
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$ 7,200,000
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| Debt Conversion, Original Debt, Amount |
143,700,000
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| Redemption price percentage |
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106.875%
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| Senior Notes Due 2026 | Senior Notes |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
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$ 400,000,000.0
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$ 289,448,000
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$ 289,448,000
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| Interest rate, stated percentage |
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5.375%
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5.375%
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5.375%
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| Proceeds from borrowings, net of issuance costs |
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$ 391,000,000.0
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| Debt issuance costs |
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$ 9,000,000.0
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| Debt Conversion, Original Debt, Amount |
$ 110,600,000
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| Redemption price percentage |
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105.375%
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