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Employee Benefit Plans (Restricted Stock Units) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value $ 28,836 $ 13,947 $ 19,732
Vesting period 4 years    
Rsus Other Than Performance Based Rsus [Member]
     
Activity:      
Outstanding, beginning of year 135,123    
Granted, shares 5,298    
Forfeited, shares (7,220)    
Fully vested, shares (85,302)    
Outstanding, end of year 47,899    
Weighted average grant date fair value:      
Outstanding, beginning of year - weighted average grant date fair value $ 46.79    
Granted - weighted average grant date fair value $ 87.73    
Forfeited - weighted average grant date fair value $ (38.88)    
Vested - weighted average grant date fair value $ (41.63)    
Outstanding, end of year - weighted average grant date fair value $ 65.07    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Aggregate intrinsic value 5,403    
Total compensation cost not yet recognized 1,650    
Compensation cost not yet recognized, period for recognition 1 year 2 months 22 days    
Performance Based Rsus [Member]
     
Activity:      
Outstanding, beginning of year 442,639    
Granted, shares 65,523    
Additional awards granted due to achievement of performance criteria, shares 7,083    
Forfeited, shares (3,889)    
Fully vested, shares (243,183)    
Outstanding, end of year 268,173 442,639  
Weighted average grant date fair value:      
Outstanding, beginning of year - weighted average grant date fair value $ 54.32    
Granted - weighted average grant date fair value $ 87.73    
Additional awards granted due to achievement of performance criteria - weighted average grant date fair value $ 46.05    
Forfeited - weighted average grant date fair value $ (62.91)    
Vested - weighted average grant date fair value $ (46.05)    
Outstanding, end of year - weighted average grant date fair value $ 69.64 $ 54.32  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Aggregate intrinsic value 30,253    
Total compensation cost not yet recognized $ 5,756    
Compensation cost not yet recognized, period for recognition 1 year 7 months 29 days    
The rate at which performance awards are expensed 100.00% 100.00% 130.00%