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Stock Incentive Compensation and Employee Benefit Plans (Equity Compensation Other than Options) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of shares:
Nonvested at Beginning of Period (in shares)	481,777	600,978	682,671
Awards granted (in shares)	209,912	229,509	258,233
Awards vested (in shares)	(185,763)	(348,611)	(332,933)
Awards forfeited (in shares)	0	(99)	(6,993)
Nonvested at End of Period (in shares)	505,926	481,777	600,978
Weighted average grant-dated fair value:
Nonvested, Weighted average grant-dated fair value, at Beginning of Period (In dollars per share)	$ 87.36	$ 76.24	$ 61.90
Awards granted, Weighted average grant-dated fair value (In dollars per share)	102.22	95.74	87.82
Awards vested, Weighted average grant-dated fair value (In dollars per share)	83.10	73.79	56.31
Awards forfeited, Weighted average grant-dated fair value (In dollars per share)	0.00	55.80	58.14
Nonvested, Weighted average grant-dated fair value, at End of Period (In dollars per share)	$ 95.09	$ 87.36	$ 76.24
Cash Settled Restricted Stock Unit (CSRSUs)
Number of shares:
Nonvested at Beginning of Period (in shares)	338,323	394,145	493,556
Awards granted (in shares)	160,817	119,382	149,760
Awards vested (in shares)	(144,440)	(159,094)	(176,265)
Awards forfeited (in shares)	(28,622)	(16,110)	(72,906)
Nonvested at End of Period (in shares)	326,078	338,323	394,145
Employee restricted stock
Number of shares:
Nonvested at Beginning of Period (in shares)	451,722	569,492	646,748
Awards granted (in shares)	195,337	215,054	241,071
Awards vested (in shares)	(168,019)	(332,725)	(311,334)
Awards forfeited (in shares)	0	(99)	(6,993)
Nonvested at End of Period (in shares)	479,040	451,722	569,492
Weighted average grant-dated fair value:
Nonvested, Weighted average grant-dated fair value, at Beginning of Period (In dollars per share)	$ 87.29	$ 76.11	$ 61.63
Awards granted, Weighted average grant-dated fair value (In dollars per share)	102.17	95.79	87.85
Awards vested, Weighted average grant-dated fair value (In dollars per share)	82.75	73.74	55.63
Awards forfeited, Weighted average grant-dated fair value (In dollars per share)	0.00	55.80	58.14
Nonvested, Weighted average grant-dated fair value, at End of Period (In dollars per share)	$ 94.95	$ 87.29	$ 76.11
Non-employee director restricted stock
Number of shares:
Nonvested at Beginning of Period (in shares)	30,055	31,486	35,923
Awards granted (in shares)	14,575	14,455	17,162
Awards vested (in shares)	(17,744)	(15,886)	(21,599)
Awards forfeited (in shares)	0	0	0
Nonvested at End of Period (in shares)	26,886	30,055	31,486
Weighted average grant-dated fair value:
Nonvested, Weighted average grant-dated fair value, at Beginning of Period (In dollars per share)	$ 88.41	$ 78.57	$ 66.83
Awards granted, Weighted average grant-dated fair value (In dollars per share)	102.90	95.06	87.40
Awards vested, Weighted average grant-dated fair value (In dollars per share)	86.37	74.96	66.06
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)	$ 97.61	$ 88.41	$ 78.57
Performance Shares
Number of shares:
Nonvested at Beginning of Period (in shares)	248,572	359,543	359,520
Awards granted (in shares)	103,024	102,668	134,358
Awards vested (in shares)	0	0	(24,606)
Awards forfeited (in shares)	(121,325)	(213,639)	(109,729)
Nonvested at End of Period (in shares)	230,271	248,572	359,543
Weighted average grant-dated fair value:
Nonvested, Weighted average grant-dated fair value, at Beginning of Period (In dollars per share)	$ 39.62	$ 30.55	$ 29.46
Awards granted, Weighted average grant-dated fair value (In dollars per share)	44.98	46.45	33.46
Nonvested, Weighted average grant-dated fair value, at End of Period (In dollars per share)	$ 41.40	$ 39.62	$ 30.55

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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-Publisher FASB
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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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