Employee Benefit Plans (Cash-Equivalent Stock Awards) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014
Cash Equivalent Stock Awards Rsus [Member]
Activity:
Outstanding, beginning of period, shares	2,049,084
Granted, shares	438,162
Additional awards granted due to achievement of performance criteria, shares	0
Forfeited, shares	(50,106)
Fully vested, shares	(752,668)
Outstanding, end of period, shares	1,684,472
Weighted average grant date fair value:
Outstanding, beginning of period - weighted average grant date fair value	$ 24.69
Granted - weighted average grant date fair value	$ 33.56
Additional awards granted due to achievement of performance criteria - weighted average grant date fair value	$ 0.00
Forfeited - weighted average grant date fair value	$ (26.75)
Vested - weighted average grant date fair value	$ (22.51)
Outstanding, end of period - weighted average grant date fair value	$ 27.98
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Vesting period	4 years
Cash Equivalent Stock Awards Performance Based [Member]
Activity:
Outstanding, beginning of period, shares	1,031,961
Granted, shares	249,438
Additional awards granted due to achievement of performance criteria, shares	104,895
Forfeited, shares	(2,769)
Fully vested, shares	(454,440)
Outstanding, end of period, shares	929,085
Weighted average grant date fair value:
Outstanding, beginning of period - weighted average grant date fair value	$ 23.67
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
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Vesting period	3 years