Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Additional information relating to the Company’s stock option plans follows:



	2016			2015		2014
Options outstanding at beginning of year	169			298		425
Options exercised	(78		)	(66	)	(108	)
Options forfeited and expired	—			(63	)	(19	)
Options outstanding at end of year	91			169		298
Options exercisable at end of year	90			164		257
Option prices per share:
Options exercised during the year	$ 28.37-93.65			28.37-93.65		28.37-93.65
Options forfeited and expired during the year	$	—		28.37-88.33		46.80-93.65
Options outstanding at end of year	$ 57.34-66.14			28.37-93.65		28.37-93.65
Options exercisable at end of year	$ 57.34-66.14			28.37-93.65		28.37-93.65

Summary of the stock options under the 2002, 2007 and 2012 plans

A summary of the Company’s options under the 2002, 2007 and 2012 Plans as of December 31, 2016, and changes during the year then ended is presented as follows:



	Shares		Weighted average exercise price		Weighted average remaining contractual term (years)	Aggregate intrinsic value
Options outstanding, December 31, 2015	169		$	61.73
Granted	—		—
Exercised	(78	)	59.24
Forfeited and expired	—		—
Options outstanding, December 31, 2016	91		$	63.84	4.9	$	12,360
Vested and expected to vest as of December 31, 2016	91		$	63.84	4.9	$	12,360
Exercisable as of December 31, 2016	90		$	63.82	4.9	$	12,227

Summary of stock options outstanding

The following table summarizes information about the Company’s stock options outstanding as of December 31, 2016:



	Outstanding				Exercisable
Exercise price range	Number of shares	Average life	Average price		Number of shares	Average price
$57.34-$57.34	23,735	4.1	57.34		23,735	57.34
$66.14-$66.14	67,258	5.1	66.14		66,258	66.14
Total	90,993	4.9	$	63.84	89,993	$	63.82

Summary of RSUs under the 2007 and 2012 plans

A summary of the Company’s RSUs under the 2007 and 2012 Plans as of December 31, 2016, and changes during the year then ended is presented as follows:



	Shares		Weighted average grant date fair value		Weighted average remaining contractual term (years)	Aggregate intrinsic value
Restricted Stock Units outstanding, December 31, 2015	750		$	84.67
Granted	187		184.88
Released	(226	)	78.94
Forfeited	(16	)	84.20
Restricted Stock Units outstanding, December 31, 2016	695		$	113.51	1.4	$	127,856
Expected to vest as of December 31, 2016	682				1.4	$	125,203

Additional information for RSUs under the 2007 and 2012 plans

Additional information relating to the Company’s RSUs under the 2007 and 2012 Plans is as follows:



	2016		2015		2014
Restricted Stock Units outstanding, January 1	750		725		733
Granted	187		248		189
Released	(226	)	(212	)	(189	)
Forfeited	(16	)	(11	)	(8	)
Restricted Stock Units outstanding, December 31	695		750		725
Expected to vest as of December 31	682		731		691