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Senior Notes, Convertible Notes and Trust Preferred Securities - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2007 | Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Debt satisfaction (gains) charges, net | $ 2,596,000 | $ (6,196,000) | $ 975,000 |  |
Convertible Debt [Member] | Six Percent Convertible Guaranteed Note [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Face amount |  |  |  |  | $ 115,000,000
Debt interest rate percentage |  |  |  |  | 6.00%
Original debt, amount |  |  | $ 12,400,000 |  |
Shares issued (in shares) |  |  | 1,892,269 |  |
Cash payments |  |  | $ 672,000 |  |
Debt satisfaction (gains) charges, net |  |  | $ 436,000 |  |
6.804% Trust Preferred Securities [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Face amount |  |  |  | $ 200,000,000 |
Debt interest rate percentage |  |  |  | 6.804% |
Effective interest percentage | 4.22% |  |  |  |
Principal amount outstanding on Trust Preferred Securities | $ 129,120,000 | 129,120,000 |  |  |
Debt issuance costs, gross | $ 1,824,000 | $ 1,924,000 |  |  |
6.804% Trust Preferred Securities [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.70% |

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