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Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2014

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,	2014			2013			2012
	(thousands of shares)
	Issued and outstanding shares – January 1	43,646			45,542			51,543
	Repurchase of shares	(5,355	)		(2,451	)		(6,399	)
	Exercise of options and issuance of restricted stock awards	151			555			398
	Issued and outstanding shares – December 31	38,442			43,646			45,542

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Tabular disclosure of the change in common stock outstanding.

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