Estimated forfeiture rate.

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Fair value of options vested.

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Number of appreciation rights, performance shares or performance units granted.

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Share based compensation arrangement by share based payment award options grants reserved shares future grants other option right Restricted stock.

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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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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 the effect of a change in accounting principle on net income.

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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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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 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 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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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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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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Percentage of vesting of share-based compensation awards.

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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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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) right $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 shares
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Unrecognized stock-based compensation expense	$ 130,748
Unrecognized stock-based compensation expense, weighted-average period recognition (in years)	1 year 23 days
Stock-based compensation expense	$ 82,588	$ 90,292	$ 72,109
Income tax benefit related to stock-based compensation expense	$ 20,461	$ 34,343	$ 27,442
Expiration period	10 years
Award vesting period	3 years
Weighted-average per share fair value of option rights granted during the year (in dollars per share) \| $ / shares	$ 90.86	$ 77.14	$ 49.36
Fair value of options vested	$ 38,580	$ 31,292	$ 32,476
Outstanding option rights (in shares) \| shares	4,485,249	4,646,313	5,163,709	5,219,506
Weighted average remaining term for options outstanding	6 years 1 month 4 days	6 years 3 months 10 days	6 years 3 months 1 day
Weighted average remaining term for options exercisable	5 years 2 days	5 years 1 month 8 days	5 years 2 months 12 days
Shares reserved for future grants of option rights restricted stock (in shares) \| shares	5,135,822	6,041,092	2,557,106
Employees
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Intrinsic value of exercised option rights	$ 190,227	$ 255,482	$ 129,230
Restricted Stock
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Weighted-average fair value of restricted stock granted during the year (in dollars per share) \| $ / shares	$ 404.08	$ 313.88	$ 257.99
Performance Shares
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Service period required for vesting of grants	3 years
Time Shares
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Award vesting period	3 years
Stock Option
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Unrecognized stock-based compensation expense	$ 61,050
Unrecognized stock-based compensation expense, weighted-average period recognition (in years)	1 year 1 month 6 days
Estimated forfeiture rate	2.00%
Stock Option \| Tranche 1
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Award vesting percentage	33.30%
Stock Option \| Tranche 2
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Award vesting percentage	33.30%
Stock Option \| Tranche 3
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Award vesting percentage	33.30%
Restricted Stock \| Employees
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Unrecognized stock-based compensation expense	$ 68,103
Unrecognized stock-based compensation expense, weighted-average period recognition (in years)	10 months 27 days
Restricted Stock \| Non-Employee Directors
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Unrecognized stock-based compensation expense	$ 1,595
Unrecognized stock-based compensation expense, weighted-average period recognition (in years)	10 months 18 days
Nonemployee Director Plan
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Number of appreciation rights, performance shares or performance units granted \| right	0
Award vesting period	3 years
Outstanding option rights (in shares) \| shares	0	0	0
ASU 2016-09
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Reduction of income tax provision	$ 43,371	$ 86,540	$ 44,233
2006 Employee Plan
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Number of shares authorized (in shares) \| shares	23,700,000
Number of appreciation rights, performance shares or performance units granted \| right	0
2006 Employee Plan \| Restricted Stock
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Service period required for vesting of grants	3 years
2006 Employee Plan \| Restricted Stock \| Tranche 1
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Award vesting percentage	33.30%
2006 Employee Plan \| Restricted Stock \| Tranche 2
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Award vesting percentage	33.30%
2006 Employee Plan \| Restricted Stock \| Tranche 3
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Award vesting percentage	33.30%
Nonemployee Director Plan
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Number of shares authorized (in shares) \| shares	200,000