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.

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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.

+ References

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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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.

+ References

No definition available.

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

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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Stock Incentive Plans and Share-Based Compensation (Details Textual) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jan. 01, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Expense		$ 0.9	$ 1.4	$ 3.4	$ 2.9
Stock Options, Unrecognized Share-based Compensation Expense		3.6		$ 3.6
Share-based Compensation Expense Not yet Recognized, Weighted-average Period for Recognition				1 year 4 months 24 days
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Expense		1.0	1.0	$ 2.1	1.1
Share-based Compensation Expense Not yet Recognized, Weighted-average Period for Recognition				2 years 3 months 18 days
Unamortized share-based compensation expense		7.4		$ 7.4
Performance Stock Units (PSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Expense		0.2	$ 0.4	$ 0.6	$ 0.5
Share-based Compensation Expense Not yet Recognized, Weighted-average Period for Recognition				2 years 4 months 24 days
Unamortized share-based compensation expense		$ 4.0		$ 4.0
2015 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common Stock Avialable for Grants of Awards		1,359,129		1,359,129
Number of Shares Available for Grant Annual Increase	1,119,924