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Employee Benefit Plans (Restricted Stock Units) (Details) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]
Mar. 31, 2014
Rsus Other Than Performance Based Rsus [Member]
Mar. 31, 2014
Performance Based Rsus [Member]
Mar. 31, 2014
Awards 2014 [Member]
Performance Based Rsus [Member]
Mar. 31, 2014
Awards 2013 [Member]
Performance Based Rsus [Member]
Mar. 31, 2014
Awards 2012 [Member]
Performance Based Rsus [Member]
Activity:            
Outstanding, beginning of year, shares   47,899 268,173      
Granted, shares   151,392 55,434      
Additional awards granted due to achievement of performance criteria, shares     34,965      
Forfeited, shares   0 0      
Fully vested, shares   (24,876) (151,480)      
Outstanding, end of year, shares   174,415 207,092      
Weighted average grant date fair value:            
Outstanding, beginning of year - weighted average grant date fair value   $ 65.07 $ 69.64      
Granted - weighted average grant date fair value   $ 100.68 $ 100.67      
Additional awards granted due to achievement of performance criteria - weighted average grant date fair value     $ 61.51      
Forfeited - weighted average grant date fair value   $ 0.00 $ 0.00      
Vested - weighted average grant date fair value   $ (65.06) $ (61.51)      
Outstanding, end of year - weighted average grant date fair value   $ 95.98 $ 82.52      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]            
Vesting period 4 years          
The rate at which performance awards are expensed       100.00% 100.00% 130.00%