Stock-based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions	9 Months Ended
Sep. 30, 2018 USD ($) $ / shares item shares	Sep. 30, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans \| item	3
Unrecognized compensation cost related to unvested awards under share-based plans \| $	$ 7.5
Cost expected to be recognized over a weighted average period	1 year 7 months 6 days
Related compensation expense \| $	$ 3.0	$ 2.4
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	0
Stock option exercised (in shares)	23,125	28,500
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	507,792	955,024
Granted (in dollars per share) \| $ / shares	$ 11.07
Restricted Stock Units (RSUs) [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	2 years 9 months 18 days	3 years
Granted (in shares)	440,292	820,024
Restricted Stock Units (RSUs) [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year	1 year
Granted (in shares)	67,500	135,000
Restricted Stock Units (RSUs) Portion 1 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	507,792	799,599
Granted (in dollars per share) \| $ / shares	$ 11.07	$ 5.06
Restricted Stock Units (RSUs) Portion 2 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		7,923
Granted (in dollars per share) \| $ / shares		$ 6.31
Restricted Stock Units (RSUs) Portion 3 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		147,542
Granted (in dollars per share) \| $ / shares		$ 7.65
Restricted Stock Units And Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock units vested \| $	$ 3.1	$ 2.6

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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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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.

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

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