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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Stock option plan activity

Following is a summary of the Company’s stock option plan activity and related information:

	Shares			Weighted Average Exercise Price				Weighted Average Remaining Contractual Term in Years		Aggregate Intrinsic Value (In  thousands)
Balance at December 31, 2014	1,800,697			$	28.78			7.25		$	51,558
Granted	287,747			62.82
Exercised	(326,418	)		26.55
Forfeited	(78,685	)		45.75
Balance at December 31, 2015	1,683,341			34.23				6.66		124,880
Exercisable at December 31, 2015	1,193,288			25.41				5.98		99,061
Options vested and expected to vest as of December 31, 2015	1,683,341			$	34.23			6.66		$	124,880

Stock option plan activity, by exercise price range

Following is a further breakdown of the options outstanding as of December 31, 2015:

Range of exercise prices	Options outstanding			Weighted average remaining  life in years		Weighted average exercise price				Options exercisable			Weighted average exercise price
$8.58 – $12.53	353,949			5.17		$	10.26			353,824			$	10.26
$12.81-16.14	371,551			5.58		14.75				342,754			14.78
$17.10-32.30	361,019			6.55		23.34				270,634			23.81
$32.76-74.42	552,544			8.18		64.69				226,076			67.13
$89.75-104.59	44,278			9.47		98.13				—			—
$8.58 – $104.59	1,683,341			6.66		$	34.23			1,193,288			$	25.41

Restricted stock activity

The following is a summary of the Company’s restricted stock activity and related information:

	Shares			Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2014	82,673			$	45.76
Granted	112,954			63.50
Vested	(49,366	)		44.8
Forfeited	(15,512	)		54.91
Outstanding at December 31, 2015	130,749			$	60.36

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- References

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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