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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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

Unrecognized cost of unvested options awarded to employees as compensation.

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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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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

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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- 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

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

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No definition available.

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- Definition

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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Share-Based Payments and Other Compensation - Plan Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation
Share-based compensation cost	$ 3.3	$ 2.4	$ 3.1
Granted, in shares	95,674
Restricted Stock
Share-based Compensation
Granted, in shares	75,718
Vesting period	4 years
Restricted Stock \| Non-employee directors
Share-based Compensation
Granted, in shares	25,926
Performance-based restricted shares
Share-based Compensation
Restricted stock granted, in shares	82,349	198,174
Granted, in shares	82,349
Weighted average fair value of units granted (in dollars per share)	$ 18.32	$ 3.37
Stock options
Share-based Compensation
Granted, in shares	95,674
Vesting period	4 years
Weighted average expense recognition period (in years)	2 years
Unrecognized compensation expense for unvested stock options	$ 0.3
Restricted Stock and RSUs
Share-based Compensation
Restricted stock granted, in shares	101,644	154,176
Weighted average fair value of units granted (in dollars per share)	$ 17.31	$ 10.43
Unrecognized compensation expense	$ 2.5
Weighted average expense recognition period (in years)	1 year 7 months 6 days
The Incentive Plan
Share-based Compensation
Shares reserved for issuance	500,000
The Incentive Plan \| Stock options
Share-based Compensation
Expiration period	10 years
2015 Plan
Share-based Compensation
Shares reserved for issuance	300,000
Shares available for grant (in shares)	1,500,000