Share-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Share-based compensation	$ 2,883	$ 3,058
Restricted Stock Units (RSUs) [Member]
Share-based compensation shares granted	501,049
Weighted average grant date fair value	$ 1.11
Restricted Stock Units (RSUs) [Member] \| Non-Employee Board Of Directors [Member]
Share-based compensation vesting period	1 year
Equivalent Stock Units (ESUs) [Member]
Share-based compensation shares granted	2,962,773
Weighted average grant date fair value	$ 1.09
Performance Stock Unit Awards (PSUs) [Member]
Share-based compensation award vesting period	3 years
Performance Stock Unit Awards (PSUs) [Member] \| Minimum [Member]
Number of common stock shares issued for each PSU	0
Performance Stock Unit Awards (PSUs) [Member] \| Maximum [Member]
Number of common stock shares issued for each PSU	2
Performance Stock Unit Awards (PSUs) [Member] \| Performance Period from January 1, 2020 to December 31, 2022 [Member]
Share-based compensation shares granted	1,036,185
Weighted average grant date fair value	$ 1.31
Performance Stock Unit Awards (PSUs) [Member] \| 50th percentile relative TSR [Member]
Percentage of vesting of share-based compensation awards	65.00%
Performance Stock Unit Awards (PSUs) [Member] \| 90th percentile relative TSR [Member]
Percentage of vesting of share-based compensation awards	200.00%

Share Based Compensation Arrangement Number Of Common Stock Shares Issued For Each Performance Stock Unit Awards

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- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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 (a)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

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- Definition

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).

+ References

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)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

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

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)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Percentage of vesting of award under share-based payment arrangement.

+ References

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