Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Restricted Stock Units Activity

RSU activity for the six months ended June 30, 2013 is summarized as follows:

	Number of Shares			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2012		292,057		$	57.89
Granted		45,895		$	188.38
Forfeited		(9,864	)	$	67.32
Settled		(86,741	)	$	41.75
Outstanding at June 30, 2013		241,347		$	88.06

Summary of Stock Option Activity

Stock option activity for the six months ended June 30, 2013 is summarized as follows:

	Number of Shares			Weighted Average Exercise Price
Outstanding at December 31, 2012		220,349		$	20.03
Exercised		(21,760	)	$	16.60
Forfeited		(363	)	$	55.18
Outstanding at June 30, 2013		198,226		$	20.34