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Noncash Share-based Compensation (Details) (USD $)
1 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2014
Jun. 30, 2014
Jun. 30, 2014
RSUs
Jun. 30, 2014
RSUs
Jun. 30, 2014
MSUs
Jun. 30, 2014
Employee Stock [Member]
Noncash Share-based Compensation (Narrative) [Line Items]            
Awards, other than options, granted in period     108,942 902,012 185,600  
Weighted average grant date fair value, per share, of awards granted in period     $ 25.50 $ 31.97 $ 49.50  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized   900,000        
Shares reserved for issuance under Plan   8,168,000       500,000
Shares available for future grants   890,446        
Inducement grants - Feb 2014 308,250          
Unrecognized compensation cost related to share-based compensation   $ 56,300,000        
Weighted average period to recognize cost, in years   2 years 8 months 30 days        
Share-based compensation arrangement by share-based payment, Minimum Employee Subscription rate   1.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate   10.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date   5.00%        
Maximum Amount Contributable by employees under ESPP- Half yearly   5,000        
Maximum Amount Contributable By Employees Under ESPP- Annually   10,000        
ESPP contributions by Employees   $ 300,000