Stock Compensation Plans and Other Employee Benefit Plans (Summary of Plans' Restricted Share Award Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restricted Stock
Non-Option Equity Instruments Outstanding [Roll Forward]
Outstanding at the beginning of period	146,112	181,522	314,226
Granted	27,165	31,463	16,932
Vested and issued	(29,018)	(60,121)	(144,860)
Forfeited	(6,666)	(6,752)	(4,776)
Outstanding at the end of period	137,593	146,112	181,522
Non-Options Equity Instruments Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding at beginning of the period	$ 47.45	$ 43.39	$ 37.99
Granted	48.17	45.00	42.14
Vested and issued	39.33	34.98	31.83
Forfeited	40.76	37.95	33.93
Outstanding at end of the period	$ 49.63	$ 47.45	$ 43.39
Vested, but not issuable, Common Shares	85,000	85,000	85,000
Vested, but not issuable, Weighted Average Grant-Date Fair Value	$ 51.88	$ 51.88	$ 51.88
Performance Shares
Non-Option Equity Instruments Outstanding [Roll Forward]
Outstanding at the beginning of period	295,679	307,512	214,565
Granted	106,017	93,535	106,268
Vested and issued	(78,590)	(15,944)	0
Forfeited	(46,573)	(89,424)	(13,321)
Outstanding at the end of period	276,533	295,679	307,512
Non-Options Equity Instruments Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding at beginning of the period	$ 38.18	$ 34.01	$ 32.08
Granted	44.35	46.86	37.90
Vested and issued	31.10	33.25	0.00
Forfeited	35.51	33.78	34.00
Outstanding at end of the period	$ 43.01	$ 38.18	$ 34.01