Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

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, 2016		1,202,426			1,198,725		$	41.66		227,213		$	49.57
Granted		(257,072	)		187,533			77.99		69,539			78.00
Exercised/vested		—			(353,636	)		41.56		(61,274	)		52.51
Canceled		91,151			(35,783	)		50.47		(55,368	)		52.74
Balance December 31, 2017		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