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Convertible Notes (Details 2) (Convertible Senior Notes [Member], USD $) | 0 Months Ended |  |
--- | --- | --- | ---
Aug. 16, 2013 | Sep. 30, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |
Principal amount of convertible notes |  | $ 310,500,000 | $ 172,500,000
1.125% Convertible Senior Notes due 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Conversion ratio | 82.8329 |  |
Principal amount of convertible notes | 138,000,000 | 138,000,000 | 0
Liability component, principal amount | 107,700,000 |  |
Equity component, principal amount | 30,300,000 |  |
Amortization period for interest expense | 5 years |  |
Convertible notes stated interest rate (as a percent) | 1.125% | 1.125% |
Expected term of debt | 5 years |  |
Issuance costs | 3,600,000 |  |
Issuance costs for liability component | 2,800,000 |  |
Issuance costs for equity component | 800,000 |  |
Initial conversion price | $ 12.07 |  |
Percentage of debt repaid upon default | 100.00% |  |
Default period of interest payment resulting in acceleration of the maturity | 30 days |  |
Minimum debt repayment as a percentage of outstanding debt after written notice of default | 25.00% |  |
Threshold for debt repayment acceleration, amount | $ 40,000,000 |  |
1.125% Convertible Senior Notes due 2018 | Triggering Event to Surrender The Notes For Early Conversion, One |  |  |
Debt Instrument [Line Items] |  |  |
Threshold for trading days | 20 days |  |
Number of consecutive trading days for threshold | 30 days |  |
Percentage of stock price to trigger conversion | 130.00% |  |
1.125% Convertible Senior Notes due 2018 | Triggering Event to Surrender The Notes For Early Conversion, Two |  |  |
Debt Instrument [Line Items] |  |  |
Threshold for trading days | 5 days |  |
Number of consecutive trading days for threshold | 5 days |  |
Maximum threshold percentage of stock price multiplied by converstion ratio | 98.00% |  |
1.125% Convertible Senior Notes due 2018 | Triggering Event to trigger the acceleration of the maturity of the notes, Five |  |  |
Debt Instrument [Line Items] |  |  |
Period for written notice of debt default | 60 days |  |
Minimum debt repayment as a percentage of outstanding debt after written notice of default | 25.00% |  |
1.125% Convertible Senior Notes due 2018 | Triggering Event to trigger the acceleration of the maturity of the notes, Six |  |  |
Debt Instrument [Line Items] |  |  |
Period for written notice of debt default | 30 days |  |
Minimum debt repayment as a percentage of outstanding debt after written notice of default | 25.00% |  |

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- Definition Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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