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Equity Plans (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 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 8,760 5,604 13,839 9,941
Total unrecognized share-based compensation costs $ 72,605   $ 72,605  
Total unrecognized share-based compensation costs, remaining period of recognition (in years)     3 years 7 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  
Non-Employee Director Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted in period     23,634  
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  
Vest on December 31, 2020 [Member] | Employee Stock Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted in period     353,757