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Net Income per Share Additional Information (Details) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2015 shares $ / shares | Dec. 31, 2014 | Nov. 27, 2013
Six Percent Tangible Equity Units [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Interest Rate Percentage |  |  | 6.00%
Convertible Debt [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Interest Rate Percentage | 3.75% | 3.75% |
Conversion price of Convertible Notes | $ / shares | $ 24.49 |  |
Minimum [Member] | Six Percent Tangible Equity Units [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Debt And Equity Instruments, shares to be Issued | 6,547,800 |  |
Maximum [Member] | Six Percent Tangible Equity Units [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Debt And Equity Instruments, shares to be Issued | 7,857,000 |  |

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