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Equity Plans (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares vested in period 566,328  
Shares surrendered to the Company for tax withholding 230,989  
Adjustments related to tax withholding for share-based compensation $ 17,804  
Forfeited unvested restricted shares 6,503  
Share-based compensation expense 5,080 4,337
Total unrecognized share-based compensation costs $ 56,501  
Total unrecognized share-based compensation costs, remaining period of recognition (in years) 2 years 5 months  
Employee Stock Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards granted in period 472,445  
Employee Stock Plan [Member] | Performance Vesting Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards granted in period 121,944  
Vest in equal annual installments over a three year period [Member] | Employee Stock Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards granted in period 68,505  
Vest on the third anniversary of the grant date [Member] | Employee Stock Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards granted in period 403,940