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Stock-Based Compensation - Narrative (Details)	3 Months Ended
	Mar. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares which may be granted under plan (in shares) | shares	4,000,000
Number of options granted (in shares) | shares	589,257
Stock compensation expense	$ 121,000
Unrecognized compensation expense for options	$ 3,200,000
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted (in shares) | shares	27,675
Vesting period	1 year
Stock compensation expense	$ 2,800
Unrecognized compensation expense for awards	$ 400,000
Unrecognized compensation expense, period for recognition	1 year
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted (in shares) | shares	921,730
Vesting period	4 years
Stock compensation expense	$ 92,700
Compensation expense for awards, associated tax benefits	21,800
Unrecognized compensation expense for awards	$ 12,400,000
Unrecognized compensation expense, period for recognition	4 years
Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 24,000
Compensation expense for awards, associated tax benefits	$ 5,600
Unrecognized compensation expense, period for recognition	4 years
Minimum | Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Maximum | Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	10 years

X

- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 1
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Paragraph 2
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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

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-Name Accounting Standards Codification
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Unrecognized cost of unvested options awarded to employees as compensation.

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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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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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Net number of non-option equity instruments granted to participants.

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

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