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Shareholders' Equity (Rollforward of Shares Issued and Outstanding) (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued - beginning balance (in shares)	44,148,116
Shares outstanding - beginning balance (in shares)	44,148,116
Shares issued - ending balance (in shares)	50,810,618	44,148,116
Shares outstanding - ending balance (in shares)	50,810,618	44,148,116
Common shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued - beginning balance (in shares)	44,148,000	42,207,000	40,024,000
Shares outstanding - beginning balance (in shares)	44,148,000	42,207,000	40,024,000
Issuance of shares (in shares)	6,777,000	1,739,000	1,947,000
Repurchase of shares (in shares)	(406,000)	0	0
Exercise of options and issuance of restricted stock awards (in shares)	292,000	202,000	236,000
Shares issued - ending balance (in shares)	50,811,000	44,148,000	42,207,000
Shares outstanding - ending balance (in shares)	50,811,000	44,148,000	42,207,000

X

- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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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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No definition available.

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Number of shares issued under share-based payment arrangement.

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Number of new stock issued during the period.

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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.

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