Stock Option Plans (Tables)

3 Months Ended

Mar. 31, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Stock Option Activity

Stock option activity under the Company’s award plans during the period indicated is as follows:

	Number of shares			Weighted average exercise price			Weighted average remaining contractual term
Balances at December 31, 2013		2,840,648		$	8.27			7.75
Granted		5,950,000			29.13
Exercised		(107,618	)		(3.40	)
Forfeited		(132,858	)		(13.53	)
Expired		(285	)		(7.12	)
Balances at March 31, 2014		8,549,887			22.76			9.19
Exercisable at March 31, 2014		1,289,224			7.37			6.46
Vested and Expected to Vest at March 31, 2014(1)		6,436,734			21.45			8.99

(1) The number of stock options expected to vest takes into account an estimate of expected forfeitures.