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Earnings/(Loss) Per Share Details Textual (Details) (USD $) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |
Senior, senior subordinated, convertible senior notes | $ 798,215,000 | $ 722,797,000
1.875% convertible senior notes due 2032 [Member] |  |
Debt Instrument [Line Items] |  |
Senior, senior subordinated, convertible senior notes | 126,500,000 | 126,500,000
Debt instrument, interest rate, stated percentage | 1.875% |
Debt instrument, convertible, conversion ratio | 17.1985 |
Conversion principal amount | $ 1,000 |

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