Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 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	180,765		100.81		64,155		100.91
Exercised	(29,412	)	17.42		(96,744	)	79.68
Forfeited	—		—		(300	)	97.92
Balance as of March 31, 2017	1,905,628		$	48.07	275,811		$	92.36

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	180,765		100.81		64,155		100.91
Exercised	(29,412	)	17.42		(96,744	)	79.68
Forfeited	—		—		(300	)	97.92
Balance as of March 31, 2017	1,905,628		$	48.07	275,811		$	92.36