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Senior Notes, Convertible Notes and Trust Preferred Securities - Narrative (Details) - 6.804% Trust Preferred Securities - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2007 | Dec. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Face amount | $ 200,000,000 |  |
Debt interest rate percentage | 6.804% |  |
Effective interest percentage |  | 3.636% |
Principal amount outstanding on Trust Preferred Securities |  | $ 129,120,000 | $ 129,120,000
Debt issuance costs, gross |  | $ 1,724,000 | $ 1,824,000
London Interbank Offered Rate (LIBOR) |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Basis spread on variable rate | 1.70% |  |

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