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Net Income per Share Additional Information (Details)
9 Months Ended
Sep. 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