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Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

(shares in thousands)	Number of Shares			Weighted-Average Exercise Price		Weighted Average Remaining Term (in years)		Aggregate Intrinsic Value
Outstanding at December 31, 2016		2,568		$	60.04
Granted		-
Exercised		(483	)
Forfeited		(20	)
Outstanding at December 31, 2017		2,065			62.08		4.0	$	42,437
Vested and expected to vest at December 31, 2017		2,065			62.08		4.0		42,437
Options exercisable at December 31, 2017		1,640		$	53.40		3.5	$	34,450

Additional information on exercises of stock options is as follows:

Additional information about RSUs is as follows:

Additional information about PBRSUs is as follows:

				Grant Date Fair Value
(shares in thousands)	Units			Weighted Average
Unvested at December 31, 2016		515		$	74.67
Granted		211		$	79.99
Converted		(91	)	$	70.69
Net adjustments based on performance		(35	)	$	81.98
Unvested at December 31, 2017		600		$	68.38

We did not issue stock options during the year ended December 31, 2017.

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

	Year ended December 31,
	2016			2015
Weighted-average fair value of stock options granted	$	12.53		$	15.18
Assumptions used to determine fair value:
Dividend yield		1.62	%		1.28	%
Risk-free rate of return		1.29	%		1.49	%
Expected life (years)		4.9			5.0
Expected volatility		25.2	%		24.7	%

Share-based compensation was as follows:

	Year ended December 31,
(in thousands)	2017		2016		2015
Stock options	$	1,093	$	7,337	$	7,399
RSUs and PBRSUs		39,126		27,861		22,169
Total share-based compensation	$	40,219	$	35,198	$	29,568

Unrecognized share-based compensation expense as of December 31, 2017 was as follows:

(in thousands)	Amount		Weighted-Average Period
Stock options	$	513	0.9 years
RSUs and PBRSUs		22,799	1.67 years
Total unrecognized share-based compensation	$	23,312