Share-based Compensation and Other Employment Benefit Plans (Stock Option) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation [Abstract]
Stock option grants (in shares)	0	0	0
Shares
Outstanding at beginning of year (in shares)	775,730	973,361	1,741,975
Options exercised (in shares)	(126,344)	(197,631)	(297,225)
Options forfeited (in shares)	0	0	(1,597)
Options expired/canceled (in shares)	(9,485)	0	(469,792)
Options outstanding at end of year (in shares)	639,901	775,730	973,361
Options exercisable at end of year (in shares)	775,730	775,730	973,361
Weighted-Average Exercise Price
Outstanding at beginning of year (in dollars per share)	$ 17.85	$ 17.76	$ 37.88
Options exercised (in dollars per share)	16.92	17.41	17.35
Options forfeited (in dollars per share)	0.00	0.00	17.64
Options expired (in dollars per share)	92.26	0.00	92.62
Options outstanding at end of year (in dollars per share)	16.93	17.85	17.76
Options exercisable at end of year (in dollars per share)	$ 16.93	$ 17.85	$ 17.76