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Debt - Senior Unsecured Notes (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Total Principal | $ 1,153,642 |
Long-term Debt, Total | 1,153,390 |
Senior Unsecured Debt [Member] |  |
Total Principal | 860,000 | $ 510,000
Unamortized debt issuance costs and original issue discount | (4,768) | (802)
Long-term Debt, Total | 855,232 | 509,198
Senior Unsecured Debt [Member] | 2025 Senior Unsecured Notes [Member] |  |
Total Principal | 50,000 | 50,000
Senior Unsecured Debt [Member] | 2027 Senior Unsecured Notes [Member] |  |
Total Principal | 50,000 | 50,000
Senior Unsecured Debt [Member] | 2028 Senior Unsecured Notes [Member] |  |
Total Principal | 60,000 | 60,000
Senior Unsecured Debt [Member] | 2029 Senior Unsecured Notes [Member] |  |
Total Principal | 100,000 | 100,000
Senior Unsecured Debt [Member] | 2030 Senior Unsecured Notes [Member] |  |
Total Principal | 125,000 | 125,000
Senior Unsecured Debt [Member] | 2030 Senior Unsecured Public Notes [Member] |  |
Total Principal | 350,000 |
Senior Unsecured Debt [Member] | 2031 Senior Unsecured Notes [Member] |  |
Total Principal | $ 125,000 | $ 125,000

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