Stock-Based Compensation Plans (Schedule of Nonvested Restricted Stock Unit Activity) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Time-Based RSUs [Member]
Number of Shares [Abstract]
Nonvested Restricted Stock Units, Number, Beginning	887,469
Awards granted	870,648
Equity Instruments Other than Options, Vested in Period	(346,069)
Restricted Stock Units, Forfeited in Period	(53,891)
Nonvested Restricted Stock Units, Number, Ending	1,358,157	887,469
Weighted-Average Price Per Share [Abstract]
Nonvested Restricted Stock Units, Weighted Average Grant Date Fair Value, Beginning	$ 3.80
Restricted Stock Units, Weighted Average Grant Date Fair Value per unit, Granted	1.38	$ 3.85
Restricted Stock Units, Vested in Period, Weighted Average Grant Date Fair Value per Unit	3.58
Restricted Stock Units, Forfeitures, Weighted Average Grant Date Fair Value	2.48
Nonvested Restricted Stock Units, Weighted Average Grant Date Fair Value, Ending	$ 2.36	$ 3.80
Performance-Based RSUs [Member]
Number of Shares [Abstract]
Nonvested Restricted Stock Units, Number, Beginning	563,469
Awards granted	0
Equity Instruments Other than Options, Vested in Period	0
Restricted Stock Units, Forfeited in Period	(55,749)
Nonvested Restricted Stock Units, Number, Ending	507,720	563,469
Weighted-Average Price Per Share [Abstract]
Nonvested Restricted Stock Units, Weighted Average Grant Date Fair Value, Beginning	$ 7.73
Restricted Stock Units, Weighted Average Grant Date Fair Value per unit, Granted	0.00
Restricted Stock Units, Vested in Period, Weighted Average Grant Date Fair Value per Unit	0.00
Restricted Stock Units, Forfeitures, Weighted Average Grant Date Fair Value	7.75
Nonvested Restricted Stock Units, Weighted Average Grant Date Fair Value, Ending	$ 7.73	$ 7.73

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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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.

+ References

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-Topic 718
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-Section 50
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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).

+ References

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- Definition

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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-Publisher FASB
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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-Publisher FASB
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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