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Capital Stock and Shares Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2015

Options generally become exercisable over a three year period. Information about options outstanding and options exercisable is as follows:

(shares in thousands)	Number of Shares			Weighted-Average Exercise Price		Weighted Average Remaining Term (in years)		Aggregate Intrinsic Value
Outstanding at December 31, 2014		2,223		$	52.81
Granted in 2015		435
Exercised in 2015		(286	)
Forfeited in 2015		(1	)
Outstanding at December 31, 2015		2,371		$	57.38		4.5	$	14,936
Vested and expected to vest as of December 31, 2015		2,315		$	57.06		4.4		14,936
Options exercisable at December 31, 2015		1,660		$	50.87		3.6	$	14,936

The following table presents additional information on exercises of stock options:

	For the years ended December 31,
(in thousands)	2015		2014		2013
Cash received upon exercise	$	9,207	$	39,605	$	42,976
Intrinsic value (market value on date of exercise less exercise price)	$	6,030	$	40,961	$	25,552

The following table presents additional information about RSUs:

The weighted-average assumptions SNI used in the model are as follows:

	For the years ended December 31,
	2015			2014			2013
Weighted-average fair value of stock options granted	$	15.18		$	19.20		$	18.94
Assumptions used to determine fair value:
Dividend yield		1.28	%		0.99	%		0.95	%
Risk-free rate of return		1.49	%		1.53	%		0.84	%
Expected life of options (years)		5.0			5.0			5.0
Expected volatility		24.7	%		27.2	%		36.3	%

A summary of share-based compensation costs is as follows:

	For the years ended December 31,
(in thousands)	2015		2014		2013
Total share-based compensation costs	$	29,568	$	35,474	$	36,845