Share-Based Compensation (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 12,874,000	$ 12,482,000	$ 9,902,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Stock option activity [Roll Forward]
Beginning balance (in shares)	2,287,399
Granted (in shares)	85,375
Exercised (in shares)	491,448	364,984	343,237
Forfeited (in shares)	2,175
Ending balance (in shares)	1,879,151	2,287,399
Exercisable (In Shares)	1,358,874
Stock option weighted average exercise price [Abstract]
Beginning balance (in dollars per share)	$ 39.67
Granted (in dollars per share)	138.03
Exercised (in dollars per share)	23.97
Forfeited (in dollars per share)	84.32
Ending balance (in dollars per share)	48.19	$ 39.67
Exercisable at end of period (in dollars per share)	$ 31.52
Weighted Average Remaining Contractual Term [Abstract]
Weighted average remaining contractual term of shares outstanding (in years)	3 years 9 months 2 days
Weighted average remaining contractual term of shares exercisable at end of period (in years)	2 years 5 months 13 days
Aggregate Intrinsic Value [Abstract]
Ending balance	$ 188,773,097
Exercisable at end of period	$ 159,166,141
Cash Proceeds and Tax Benefits [Abstract]
Exercised (in shares)	491,448	364,984	343,237
Cash proceeds	$ 11,779,000	$ 9,809,000	$ 10,340,000
Intrinsic value of options exercised	61,469,000	33,302,000	21,094,000
Tax benefits realized	$ 15,367,000	$ 12,809,000	$ 7,891,000
Grant Date Fair Value Assumptions [Abstract]
Expected volatility (in hundredths)	23.70%	26.60%	29.70%
Expected term (in years)	7 years 3 months 4 days	7 years 3 months 4 days	7 years 1 month 6 days
Risk-free interest rate (in hundredths)	2.87%	2.44%	1.75%
Expected dividend yield (in hundredths)	1.50%	1.50%	1.50%
Grant date fair value (in dollars per share)	$ 35.71	$ 32.00	$ 22.86
Share-based compensation	$ 3,218,000	$ 3,553,000	$ 3,735,000
Recognized tax benefits	805,000	888,000	1,409,000
Unamortized compensation expense	$ 3,300,000
Expense recognition over weighted average period (in years)	2 years 5 months 1 day
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Award performance period	3 years
Shares available for grant	1,108,023
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 9,151,000	$ 8,547,000	$ 5,993,000
Unamortized compensation expense	$ 7,600,000
Expense recognition over weighted average period (in years)	2 years 8 months 12 days
Restricted stock awards [Roll Forward]
Beginning balance (in shares)	297,524
Granted (at market price) (in shares)	80,598
Vested (in shares)	68,149	79,224	95,420
Forfeited (in shares)	2,200
Ending balance (in shares)	307,773	297,524
Restricted stock awards weighted average grant date fair value [Abstract]
Beginning balance (in dollars per share)	$ 83.36
Granted (at market price) (in dollars per share)	138.25
Vested (in dollars per share)	64.78
Forfeited (in dollars per share)	77.89
Ending balance (in dollars per share)	$ 101.93	$ 83.36
Vested (in shares)	68,149	79,224	95,420
Fair value of restricted stock awards vested	$ 9,642,000	$ 9,260,000	$ 7,960,000
ESPP Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased under the ESPP (in shares)	15,966	16,610	8,649
Grant Date Fair Value of most recent ESPP Purchase (per share)	$ 31.43
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 500,000	$ 355,000	$ 173,000
LTIP 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period	10 years
Number of shares allocated for issuance (in shares)	9,315,000
Shares available for grant	4,453,450
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares allocated for issuance (in shares)	956,250
Discounted percentage rate offered under the employee stock purchase plan (in hundredths)	85.00%
Minimum [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award performance period, extension period	1 year
Maximum [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award performance period, extension period	2 years
Split Vesting [Member] \| Minimum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Split Vesting [Member] \| Minimum [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Split Vesting [Member] \| Maximum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Split Vesting [Member] \| Maximum [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years

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Cash Proceeds and Tax Benefits [Abstract]

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Employees meeting the minimum age and length of service requirements may purchase stock at a discounted percentage rate.

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Grant Date Fair Value of ESPP Purchase in dollars per share

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Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period

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Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period, Extension

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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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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.

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Weighted average expected volatility rate of share-based compensation awards.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Weighted average price of options that were either forfeited or expired.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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