Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

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, 2017:

	Restricted Stock Units		Weighted Average Grant Date Fair Value
Restricted stock units outstanding at December 31, 2016	2,051,986		$	24.12
Granted	592,922		29.94
Released	(421,108	)	23.24
Forfeited	(38,334	)	27.57
Restricted stock units outstanding at December 31, 2017	2,185,466		25.81