Percentage of award earned based on performance of absolute return to stockholders.

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- Definition

Percentage of award earned based on performance of relative return to stockholders.

+ References

No definition available.

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- Definition

Performance measurement period, end date.

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No definition available.

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Performance measurement period, start date.

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- Definition

Total return to stockholders for participants to fully earn awards on absolute basis.

+ References

No definition available.

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- Definition

Total return to stockholders for participants to start to earn awards on absolute basis.

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No definition available.

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- Definition

Share based compensation arrangement by share based payment award grant date fair value.

+ References

No definition available.

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- Definition

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.

+ References

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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- Definition

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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- Definition

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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- Definition

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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- Definition

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

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- Definition

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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No definition available.

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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.

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- Definition

Percentage of vesting of share-based compensation awards.

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Incentive Compensation - Additional Information (Details) - USD ($)			3 Months Ended		9 Months Ended
	Apr. 03, 2018	Feb. 05, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense			$ 4,330,000	$ 3,825,000	$ 15,245,000	$ 11,692,000
Equity Incentive Plan [Member] \| Full Value Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for grant			9,254,010		9,254,010
2017 Performance Program [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance measurement period, term		3 years
Performance measurement period, start date		Jan. 01, 2018
Performance measurement period, end date		Dec. 31, 2020
Percentage of award earned based on performance of absolute shareholder return		25.00%
Fair value of awards granted		$ 7,009,000
Vesting period		4 years
2017 Performance Program [Member] \| At 30th Percentile [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shareholder return for participants to start earning awards on absolute basis		18.00%
2017 Performance Program [Member] \| Exceeds 80th Percentile [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of award earned based on performance of relative shareholder return		75.00%
2017 Performance Program [Member] \| Share-Based Compensation Award Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of the awards that vest		50.00%
2017 Performance Program [Member] \| Share-Based Compensation Award Tranche Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of the awards that vest		50.00%
2017 Performance Program [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shareholder return for participants to fully earn awards on absolute basis		30.00%
2017 Performance Program [Member] \| Minimum [Member] \| At 30th Percentile [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of the awards that vest		18.00%
2015 Performance Program [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance measurement period, units forfeited	779,055
Unrecognized compensation cost	$ 947,000
Unrecognized compensation cost, recognized over a weighted-average period	1 year 7 months 6 days