Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Stockholders' Equity [Abstract]

Stock Option and Restricted Stock Activity

The following table summarizes stock option and restricted stock activity for the Plans:

				Stock Options					Restricted Shares
	Shares Available for Grant			Shares			Weighted Average Exercise Price per Share ($)		Shares			Weighted Average Exercise Price per Share ($)
Balance January 1, 2018		1,036,505			996,839		$	48.21		180,110		$	58.57
Granted		(260,508	)		191,147			76.09		69,361			76.26
Exercised/vested		—			(98,945	)		33.83		(59,649	)		56.44
Canceled		90,026			(34,782	)		65.47		(55,244	)		58.57
Balance December 31, 2018		866,023			1,054,259			54.04		134,578			68.64
Granted		(388,162	)		271,261			54.44		116,901			54.51
Exercised/vested		—			(79,686	)		27.26		(40,776	)		60.79
Canceled		51,181			(18,214	)		66.93		(32,967	)		61.87
Balance December 31, 2019		529,042			1,227,620			55.83		177,736			62.40
Authorized		1,300,000			—			—		—			—
Granted		(394,290	)		286,078			57.67		108,212			56.93
Exercised/vested		—			(93,099	)		35.11		(43,702	)		66.07
Canceled		97,494			(57,233	)		63.92		(40,261	)		65.42
Balance December 31, 2020		1,532,246			1,363,366		$	57.29		201,985		$	58.07