Stock Incentive Compensation and Employee Benefit Plans (Schedule of Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Weighted options outstanding
Beginning balance (in shares)	32,001	206,795	408,212
Options granted (in shares)	0	0	0
Options forfeited (in shares)	0	0	0
Options expired (in shares)	0	0	0
Options exercised (in shares)	(32,001)	(174,794)	(201,417)
Ending balance (in shares)	0	32,001	206,795	408,212
Weighted options outstanding, Total options exercisable (in shares)	0
Weighted average exercise price
Beginning balance (in usd per share)	$ 53.86	$ 53.17	$ 51.90
Options granted, Weighted average exercise price (in usd per share)	0.00	0.00	0.00
Options forfeited, Weighted average exercise price (in usd per share)	0.00	0.00	0.00
Options expired, Weighted average exercise price (in usd per share)	0.00	0.00	0.00
Options exercised, Weighted average exercise price (in usd per share)	53.86	53.04	50.59
Ending balance (in usd per share)	0.00	$ 53.86	$ 53.17	$ 51.90
Weighted average exercise price, Total options exercisable (in usd per share)	$ 0.00
Weighted average remaining contractual life	1 day	2 months 12 days	10 months 24 days	1 year 7 months 6 days
Weighted average remaining contractual life, Total options exercisable	1 day
Aggregate intrinsic value, Options outstanding	$ 0	$ 2,295	$ 17,174	$ 25,020
Aggregate intrinsic value, Options exercised	2,320	$ 15,945	$ 14,806
Aggregate intrinsic value, Total options exercisable	$ 0
Range of exercise prices, lower range limit (in usd per share)			$ 50.71	$ 42.66
Range of exercise prices, upper range limit (in usd per share)			$ 59.66	$ 59.66
Range of exercise prices, Total options outstanding (in usd per share)	$ 0.00	$ 53.86
Range of exercise prices, Total options exercisable (in usd per share)	$ 0.00