Shareholders' Equity - Schedule of Stock Options Outstanding Activity (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Outstanding, beginning balance (in shares)	667	667
Granted (in shares)	0	0
Exercised (in shares)	0	0
Canceled / forfeited / expired (in shares)	0	0
Outstanding, ending balance (in shares)	667	667	667
Number of Shares, Vested and exercisable (in shares)	0
Weighted-Average Exercise Price
Outstanding, beginning balance (in dollars per share)	$ 33.75	$ 33.75
Granted (in dollars per share)	0	0
Exercised (in dollars per share)	0	0
Canceled / forfeited / expired (in dollars per share)	0	0
Outstanding, ending balance (in dollars per share)	33.75	$ 33.75	$ 33.75
Weighted-Average Exercise Price, Vested and exercisable (in dollars per share)	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-Average Remaining Contractual Term, Outstanding (in years)	1 year 3 months	1 year 3 months	1 year 3 months
Aggregate Intrinsic Value, Balance	$ 0	$ 0	$ 0
Aggregate Intrinsic Value, Vested and exercisable	$ 0

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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- Definition

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

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No definition available.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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