General - Stock Compensation - Nonvested - Activity (Details)	9 Months Ended
Sep. 30, 2020 $ / shares shares
Restricted Stock Awards
Shares
Outstanding, beginning of period (in shares) \| shares	39,761
Awarded (in shares) \| shares	16,976
Vested (in shares) \| shares	(39,761)
Outstanding, end of period (in shares) \| shares	16,976
Weighted Average Grant Date Fair Value
Outstanding, beginning of period (in dollars per share) \| $ / shares	$ 65.40
Awarded (in dollars per share) \| $ / shares	70.70
Vested (in dollars per share) \| $ / shares	65.40
Outstanding, end of period (in dollars per share) \| $ / shares	$ 70.70
Restricted Stock Units (RSUs)
Shares
Outstanding, beginning of period (in shares) \| shares	256,430
Awarded (in shares) \| shares	344,774
Vested (in shares) \| shares	(100,416)
Forfeited (in shares) \| shares	(32,202)
Outstanding, end of period (in shares) \| shares	468,586
Weighted Average Grant Date Fair Value
Outstanding, beginning of period (in dollars per share) \| $ / shares	$ 74.12
Awarded (in dollars per share) \| $ / shares	62.02
Vested (in dollars per share) \| $ / shares	74.93
Forfeited (in dollars per share) \| $ / shares	66.90
Outstanding, end of period (in dollars per share) \| $ / shares	$ 65.54
Performance Based Restricted Stock Units ("PSUs")
Shares
Outstanding, beginning of period (in shares) \| shares	248,559
Awarded (in shares) \| shares	133,752
Vested (in shares) \| shares	(52,861)
Forfeited (in shares) \| shares	(48,008)
Outstanding, end of period (in shares) \| shares	281,442
Weighted Average Grant Date Fair Value
Outstanding, beginning of period (in dollars per share) \| $ / shares	$ 104.27
Awarded (in dollars per share) \| $ / shares	75.65
Vested (in dollars per share) \| $ / shares	76.24
Forfeited (in dollars per share) \| $ / shares	85.68
Outstanding, end of period (in dollars per share) \| $ / shares	$ 99.11

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

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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).

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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).

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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.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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