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Equity Compensation Plans - Restricted Stock and RSUs (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Equity Compensation Plans
Vesting period	3 years
Restricted stock and restricted stock units
Changes in unvested awards
Nonvested at the beginning of the period (in shares)		409,000
Granted (in shares)		161,500	170,000
Vested (in shares)		(91,500)
Forfeited (in shares)		(14,000)
Nonvested at the end of the period (in shares)	465,000	465,000	409,000
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)		$ 5.89
Granted (in dollars per share)		11.04
Vested (in dollars per share)		5.07
Forfeited (in dollars per share)		7.53
Nonvested at the end of the period (in dollars per share)	$ 7.79	$ 7.79	$ 5.89
Additional information
Total unrecognized compensation cost of restricted awards	$ 1.7	$ 1.7
Expected weighted-average period for recognition of unrecognized compensation		2 years 2 months 1 day

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
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Unrecognized cost of unvested share-based awards, other than 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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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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