Stock Incentive Compensation and Employee Benefit Plans (Equity Compensation Other than Options) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Settled Restricted Stock Unit (CSRSUs)
Number of shares:
Nonvested at Beginning of Period (in shares)	326,078	338,323	394,145
Awards granted (in shares)	135,119	160,817	119,382
Awards vested (in shares)	(133,278)	(144,440)	(159,094)
Awards forfeited (in shares)	(19,575)	(28,622)	(16,110)
Nonvested at End of Period (in shares)	308,344	326,078	338,323
Performance Shares
Number of shares:
Nonvested at Beginning of Period (in shares)	230,271	248,572	359,543
Awards granted (in shares)	77,045	103,024	102,668
Awards vested (in shares)	(58,032)	0	0
Awards forfeited (in shares)	(37,903)	(121,325)	(213,639)
Nonvested at End of Period (in shares)	211,381	230,271	248,572
Weighted average grant-dated fair value:
Nonvested, Weighted average grant-dated fair value, at Beginning of Period (In dollars per share)	$ 41.40	$ 39.62	$ 30.55
Awards granted, Weighted average grant-dated fair value (In dollars per share)	48.31	44.98	46.45
Awards vested, Weighted average grant-dated fair value (In dollars per share)	38.80
Nonvested, Weighted average grant-dated fair value, at End of Period (In dollars per share)	$ 44.63	$ 41.40	$ 39.62
Employee restricted stock
Number of shares:
Nonvested at Beginning of Period (in shares)	479,040	451,722	569,492
Awards granted (in shares)	179,003	195,337	215,054
Awards vested (in shares)	(255,873)	(168,019)	(332,725)
Awards forfeited (in shares)	0	0	(99)
Nonvested at End of Period (in shares)	402,170	479,040	451,722
Weighted average grant-dated fair value:
Nonvested, Weighted average grant-dated fair value, at Beginning of Period (In dollars per share)	$ 94.95	$ 87.29	$ 76.11
Awards granted, Weighted average grant-dated fair value (In dollars per share)	112.41	102.17	95.79
Awards vested, Weighted average grant-dated fair value (In dollars per share)	93.98	82.75	73.74
Awards forfeited, Weighted average grant-dated fair value (In dollars per share)	0.00	0.00	55.80
Nonvested, Weighted average grant-dated fair value, at End of Period (In dollars per share)	$ 103.34	$ 94.95	$ 87.29
Non-employee director restricted stock
Number of shares:
Nonvested at Beginning of Period (in shares)	26,886	30,055	31,486
Awards granted (in shares)	14,727	14,575	14,455
Awards vested (in shares)	(16,068)	(17,744)	(15,886)
Awards forfeited (in shares)	0	0	0
Nonvested at End of Period (in shares)	25,545	26,886	30,055
Weighted average grant-dated fair value:
Nonvested, Weighted average grant-dated fair value, at Beginning of Period (In dollars per share)	$ 97.61	$ 88.41	$ 78.57
Awards granted, Weighted average grant-dated fair value (In dollars per share)	114.71	102.90	95.06
Awards vested, Weighted average grant-dated fair value (In dollars per share)	96.83	86.37	74.96
Awards forfeited, Weighted average grant-dated fair value (In dollars per share)	0.00	0.00	0.00
Nonvested, Weighted average grant-dated fair value, at End of Period (In dollars per share)	$ 107.95	$ 97.61	$ 88.41
Restricted Stock
Number of shares:
Nonvested at Beginning of Period (in shares)	505,926	481,777	600,978
Awards granted (in shares)	193,730	209,912	229,509
Awards vested (in shares)	(271,941)	(185,763)	(348,611)
Awards forfeited (in shares)	0	0	(99)
Nonvested at End of Period (in shares)	427,715	505,926	481,777
Weighted average grant-dated fair value:
Nonvested, Weighted average grant-dated fair value, at Beginning of Period (In dollars per share)	$ 95.09	$ 87.36	$ 76.24
Awards granted, Weighted average grant-dated fair value (In dollars per share)	112.59	102.22	95.74
Awards vested, Weighted average grant-dated fair value (In dollars per share)	94.15	83.10	73.79
Awards forfeited, Weighted average grant-dated fair value (In dollars per share)	0.00	0.00	55.80
Nonvested, Weighted average grant-dated fair value, at End of Period (In dollars per share)	$ 103.61	$ 95.09	$ 87.36