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Senior Notes, Convertible Notes and Trust Preferred Securities - Schedule of Long-term Debt Instruments (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | May 31, 2014 | Jun. 30, 2013
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Unamortized debt issuance costs | $ (7,258,000) |  |  |
Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of debt component | 500,000,000 | $ 500,000,000 |  |
Unamortized debt discounts | (1,507,000) | (1,780,000) |  |
Unamortized debt issuance costs | (3,295,000) | (3,858,000) |  |
Long-term debt | 495,198,000 | 494,362,000 |  |
Senior Notes [Member] | Senior Notes Due 2024 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of debt component | $ 250,000,000 | $ 250,000,000 |  |
Debt interest rate percentage | 4.40% | 4.40% | 4.40% |
Issue Price | 99.883% |  |  |
Senior Notes [Member] | Senior Notes Due 2023 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of debt component | $ 250,000,000 | $ 250,000,000 |  |
Debt interest rate percentage | 4.25% | 4.25% |  | 4.25%
Issue Price | 99.026% |  |  |

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