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Senior Notes, Convertible Notes and Trust Preferred Securities - Narrative (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) shares | Dec. 31, 2010 USD ($) | Dec. 31, 2007 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percent of notes required to be repurchased at the option of the holders on set dates |  |  |  | 100.00% |
Converted instrument, amount | $ 3,828,000 | $ 12,763,000 | $ 54,905,000 |  |
Issuance of common shares upon conversion of Convertible Notes (in shares) | shares | 519,664 | 1,904,542 | 7,944,673 |  |
Repayments of convertible debt | $ 529,000 | $ 233,000 | $ 3,270,000 |  |
Debt satisfaction expense | 476,000 | 2,436,000 | $ 13,536,000 |  |
6.00% Convertible Guaranteed Note [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Face Amount | $ 12,400,000 | 16,228,000 |  | $ 115,000,000 |
Debt interest rate percentage |  |  |  | 6.00% |
Convertible debt conversion ratio | 0.1565514 |  |  |  |
Convertible debt conversion price | $ / shares | $ 6.39 |  |  |  |
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%
Principal amount outstanding on Trust Preferred Securities | $ 129,120,000 | $ 129,120,000 |  |  |
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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