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Incentive Share Plan (Schedule of Share-Based Incentive Plan Activity) (Details) - 2008 Long-Term Equity Incentive Ownership Plan [Member] - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Non-vested, beginning balance (in shares)	2,339,932
Granted (in shares)	1,075,000	762,630	653,472
Vested (in shares)	(478,607)	(284,964)	(560,126)
Forfeited (in shares)	(32,479)
Non-vested, ending balance (in shares)	2,903,846	2,339,932
Shares, Available for grant (in shares)	409,344
Weighted Average Grant Date Fair Value
Non-vested, ending balance (in dollars per share)	$ 9.45	$ 11.52
Granted (in dollars per share)	5.69	$ 9.46	$ 11.07
Vested (in dollars per share)	11.07
Forfeited (in dollars per share)	10.80
Non-vested, beginning balance (in dollars per share)	$ 11.52

X

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ 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
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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

+ References

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ 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 (d)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Number of non-vested options outstanding.

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- Definition

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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- Definition

Number of non-vested options forfeited.

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- Definition

Weighted average grant-date fair value of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options outstanding.

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Number of options vested.

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Weighted average grant-date fair value of options vested.

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