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Debt (Details Textual) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011
Senior Notes 2015 [Member] |  |
Debt (Textual) [Abstract] |  |
Senior Notes | 6.05% |
Aggregate principal amount | $ 75,000 |
Unaccrued discount | 71 | 92
Imputed rate | 6.10% |
Senior notes, maturity period | 2015 |
Senior Notes 2016 [Member] |  |
Debt (Textual) [Abstract] |  |
Senior Notes | 6.85% |
Aggregate principal amount | 125,000 |
Unaccrued discount | $ 136 | $ 164
Imputed rate | 6.90% |
Senior notes, maturity period | 2016 |

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