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Stock-based Compensation (Narrative) (Details)	9 Months Ended
	Sep. 30, 2017 USD ($) $ / shares item shares	Sep. 30, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans | item	2
Unrecognized compensation cost related to unvested awards under share-based plans | $	$ 5,900,000
Cost expected to be recognized over a weighted average period	2 years
Related compensation expense | $	$ 2,400,000	$ 2,000,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	300,000
Vesting period		4 years
Stock option exercised (in shares)	28,500	0
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	955,024	789,000
Granted (in dollars per share) | $ / shares	$ 5.47
Fair value of restricted stock units vested | $	$ 2,600,000	$ 830,000
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	3 years	3 years
Granted (in shares)	820,024	620,000
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)	135,000	169,000
Restricted Stock Units (RSUs) Portion 1 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	799,559	489,000
Granted (in dollars per share) | $ / shares	$ 5.06	$ 4.50
Restricted Stock Units (RSUs) Portion 2 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	7,923	300,000
Granted (in dollars per share) | $ / shares	$ 6.31	$ 6.75
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

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Number Of Stock-based Compensation Plans

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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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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