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Senior Notes, Convertible Notes and Trust Preferred Securities - Narrative (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2007 | May 31, 2014 | Jun. 30, 2013 | Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Debt satisfaction (gains) charges, net | $ (6,196,000) | $ 975,000 | $ (25,150,000) |  |  |  |
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 | $ 3,828,000 |  |  |  |
Shares issued (in shares) |  | 1,892,269 | 519,664 |  |  |  |
Cash payments |  | $ 672,000 | $ 529,000 |  |  |  |
Debt satisfaction (gains) charges, net |  | 436,000 | $ 476,000 |  |  |  |
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 | 3.078% |  |  |  |  |  |
Principal amount outstanding on Trust Preferred Securities | $ 129,120,000 | 129,120,000 |  |  |  |  |
Debt issuance costs, gross | 1,924,000 | 2,024,000 |  |  |  |  |
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% |  |  |
Senior Notes [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Face amount | 500,000,000 | 500,000,000 |  |  |  |  |
Long-term debt | 495,198,000 | 494,362,000 |  |  |  |  |
Senior Notes [Member] | Senior Notes Due 2024 [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Face amount | $ 250,000,000 | $ 250,000,000 |  |  |  |  |
Debt interest rate percentage | 4.40% | 4.40% |  |  | 4.40% |  |
Senior Notes [Member] | Senior Notes Due 2023 [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Face amount | $ 250,000,000 | $ 250,000,000 |  |  |  |  |
Debt interest rate percentage | 4.25% | 4.25% |  |  |  | 4.25% |

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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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