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Employee Benefit Plans (Restricted Stock Units) (Details) (USD $)
9 Months Ended
Sep. 30, 2014
Restricted Stock Units (RSUs) [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]  
Vesting period 4 years
Rsus Other Than Performance Based Rsus [Member]
 
Activity:  
Outstanding, beginning of period, shares 143,697
Granted, shares 454,176
Forfeited, shares (8,061)
Fully vested, shares (77,700)
Outstanding, end of period, shares 512,112
Weighted average grant date fair value:  
Outstanding, beginning of period - weighted average grant date fair value $ 21.69
Granted - weighted average grant date fair value $ 33.56
Forfeited - weighted average grant date fair value $ (31.71)
Vested - weighted average grant date fair value $ (21.68)
Outstanding, end of period - weighted average grant date fair value $ 32.06
Performance Based Rsus [Member]
 
Activity:  
Outstanding, beginning of period, shares 804,519
Granted, shares 166,302
Additional awards granted due to achievement of performance criteria, shares 104,895
Forfeited, shares (1,848)
Fully vested, shares (454,440)
Outstanding, end of period, shares 619,428
Weighted average grant date fair value:  
Outstanding, beginning of period - weighted average grant date fair value $ 23.21
Granted - weighted average grant date fair value $ 33.56
Additional awards granted due to achievement of performance criteria - weighted average grant date fair value $ 20.50
Forfeited - weighted average grant date fair value $ (25.28)
Vested - weighted average grant date fair value $ (20.50)
Outstanding, end of period - weighted average grant date fair value $ 27.51
Awards 2014 [Member] | Performance Based Rsus [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]  
The rate at which performance awards are expensed 100.00%
Awards 2013 [Member] | Performance Based Rsus [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]  
The rate at which performance awards are expensed 100.00%
Awards 2012 [Member] | Performance Based Rsus [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]  
The rate at which performance awards are expensed 135.00%