Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Restricted Stock Unit Activity

The table below summarizes restricted stock unit activity for the year ended December 31, 2013:

	Restricted Stock Units		Weighted Average Grant Date Fair Value
Restricted stock units outstanding at December 31, 2012	932,601		$	32.90
Granted	302,272		42.47
Released	(149,304	)	31.86
Cancelled	(7,520	)	38.29
Restricted stock units outstanding at December 31, 2013	1,078,049		35.69