Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2017

Equity [Abstract]

Stock option plan activity

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

	Stock Options				Restricted Stock Awards
	Shares		Weighted- Average Exercise Price		Shares		Weighted- Average Grant Date Fair Value
Balance as of December 31, 2016	1,754,275		$	42.12	308,700		$	86.61
Granted	198,101		101.93		68,151		101.64
Options exercised/RSUs vested	(80,872	)	29.11		(100,476	)	81.15
Forfeited	—		—		(300	)	97.92
Balance as of June 30, 2017	1,871,504		$	49.02	276,075		$	92.30

Restricted stock activity

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

	Stock Options				Restricted Stock Awards
	Shares		Weighted- Average Exercise Price		Shares		Weighted- Average Grant Date Fair Value
Balance as of December 31, 2016	1,754,275		$	42.12	308,700		$	86.61
Granted	198,101		101.93		68,151		101.64
Options exercised/RSUs vested	(80,872	)	29.11		(100,476	)	81.15
Forfeited	—		—		(300	)	97.92
Balance as of June 30, 2017	1,871,504		$	49.02	276,075		$	92.30