Employee Benefit Plans (Cash-Equivalent Stock Awards) (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Cash Equivalent Stock Awards Rsus [Member]
Activity:
Outstanding, beginning of year, shares	2,049,084
Granted, shares	438,162
Additional awards granted due to achievement of performance criteria, shares	0
Forfeited, shares	(38,886)
Fully vested, shares	(751,920)
Outstanding, end of year, shares	1,696,440	2,049,084
Weighted average grant date fair value:
Outstanding, beginning of year - 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	$ (26.36)
Vested - weighted average grant date fair value	$ (22.47)
Outstanding, end of year - weighted average grant date fair value	$ 27.93	$ 24.69
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 year, 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 year, shares	929,085	1,031,961
Weighted average grant date fair value:
Outstanding, beginning of year - 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 year - weighted average grant date fair value	$ 27.51	$ 23.67
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Vesting period		3 years