Shareholders' Equity - Issuer Purchases of Equity Securities (Details) - $ / shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 19, 2018
Subsidiary, Sale of Stock
Authorized shares for repurchase (shares)			400,000
Shares repurchased (shares)	58,499	34,168
Common Stock
Subsidiary, Sale of Stock
Shares repurchased (shares)	58,499	34,168
Weighted average share repurchased (in dollars per share)	$ 17.69	$ 28.87

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration