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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares vested in period     495,558  
Shares surrendered to the Company for tax withholding     201,622  
Adjustments related to tax withholding for share-based compensation     $ 11,950  
Forfeited unvested restricted shares     25,653  
Share-based compensation expense 5,604 4,901 9,941 8,484
Total unrecognized share-based compensation costs $ 35,813   $ 35,813  
Total unrecognized share-based compensation costs, remaining period of recognition (in years)     2 years 1 month  
Employee Stock Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted in period     365,509  
Employee Stock Plan [Member] | Performance Vesting Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted in period     80,355  
Non-Employee Director Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted in period     20,064