Estimated Forfeiture rates for Share Based Compensation

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Reserved

+ References

No definition available.

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- Definition

Share based Compensation Arrangement By Share based Payment Award Options Contractual Term

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement By Share-based Payment Award, Employee Contribution, Amount

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement By Share-based Payment Award, Employee Contribution, Percent

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section S99
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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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- Definition

Discount rate from fair value on offering date that participants pay for shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

Discount rate from fair value on purchase date that participants pay for shares.

+ References

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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

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.

+ References

+ Details

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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- Definition

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

+ References

+ Details

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- Definition

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).

+ References

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- Definition

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.

+ References

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- Definition

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.

+ References

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- Definition

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

+ References

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- Definition

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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Stock-Based Compensation Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
Stock-Based Compensation Narrative (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	May 04, 2017	May 01, 2010	Apr. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value		$ 4,100,000	$ 9,700,000	$ 2,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Reserved		3,500,000				5,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		2,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms		1 year 1 month 6 days
Share based Compensation Arrangement By Share based Payment Award Options Contractual Term		10 years
Allocated Share-based Compensation Expense		$ 9,703,000	$ 12,549,000	$ 6,332,000
Estimated Forfeiture rates for Share Based Compensation	17.00%	10.00%		18.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate					43.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term					4 years 3 months
2017 OMNIBUS Incentive Plan [Member] [Domain]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		2,600,000
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized		$ 7,000,000
Employee Stock [Member]
Allocated Share-based Compensation Expense				$ 200,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate		38.00%	33.30%	28.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate		0.00%	0.00%	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		6 months	6 months	6 months
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate				1.40%
Maximum [Member] \| Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		2.56%	1.45%	0.60%
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value		$ 13,600,000	$ 14,800,000	$ 5,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 64.48	$ 63.63	$ 30.37
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		1,000,000					1,000,000	500,000
Share-based Compensation Arrangement By Share-based Payment Award, Employee Contribution, Amount		$ 5,000
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date		85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date		85.00%
Employee Stock [Member] \| Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		300,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized		$ 200,000
Allocated Share-based Compensation Expense	$ 200,000	$ 400,000
Employee Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement By Share-based Payment Award, Employee Contribution, Percent		15.00%