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Earnings/(Loss) Per Share Details Textual (Details) (1.875% convertible senior notes due 2032 [Member], USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2012
1.875% convertible senior notes due 2032 [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount of offering | $ 126,500,000 | $ 126,500,000
Debt instrument, interest rate, stated percentage | 1.875% | 1.875%
Debt instrument, convertible, conversion ratio | 17.1985 |
Conversion principal amount |  | $ 1,000

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