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Equity - Preferred Stock (Details) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Stockholders Equity Note [Line Items] |  |
Shares authorized (in shares) | 50,000 | 50,000
Shares oustanding at end of period (in shares) | 7,650 | 7,650
8.5% Convertible perpetual preferred stock |  |
Stockholders Equity Note [Line Items] |  |
Shares oustanding at end of period (in shares) | 2,650 | 2,650
6.0% Convertible perpetual preferred stock |  |
Stockholders Equity Note [Line Items] |  |
Shares oustanding at end of period (in shares) | 2,000 | 2,000
7.0% Convertible perpetual preferred stock |  |
Stockholders Equity Note [Line Items] |  |
Shares oustanding at end of period (in shares) | 3,000 | 3,000

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