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Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Stockholders' Equity Note [Abstract]

Rollforward of Common Stock Issued and Outstanding

The following table is a summary of changes in common shares issued and outstanding:

			Year ended December 31,			2020						2019						2018
			(thousands of shares)
			Beginning balance			44,148						42,207						40,024
			Issuance of shares			6,777						1,739						1,947
			Repurchase of shares			(406)						—						—
			Exercise of options and issuance of restricted stock awards			292						202						236
			Ending balance			50,811						44,148						42,207

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Tabular disclosure of the change in common stock outstanding.

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