Annual report pursuant to Section 13 and 15(d)

Stock Incentive Plans (Narrative) (Details)

v2.4.0.8
Stock Incentive Plans (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Length of time options exercisable, years 10 years    
Shares available for future awards 1,414,240    
Allocated Share-based Compensation Expense $ 36,153 $ 25,001 $ 18,141
Income tax benefit recognized 7,575 8,952 5,804
Fair value of restricted stock and restricted stock units 49,032 38,576 22,280
Unrecognized compensation cost related to non-vested share 87,901    
Weighted-average period 1 year 8 months 12 days    
Actual tax benefit realized $ 508 $ 1,078 $ 955
Employee stock purchase plan issued 42,084 47,613 34,966
Stock Options [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options vesting period, years 3 years    
Stock Options [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options vesting period, years 5 years    
Restricted Stock Units Awards [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options vesting period, years 1 year    
Restricted Stock Units Awards [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options vesting period, years 10 years