Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

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

Summary of Vested and Unvested Restricted Stock Units Outstanding

The following table summarizes information about vested and unvested restricted stock units, excluding cash-settled EBI units discussed above, outstanding at December 31, 2018:

	For the year ended
	December 31,
	2018
	Restricted Stock Units Outstanding		Weighted Average Grant Date Fair Value
Balance at beginning of period	1,214,109		$	19.97
Conversion of deferred compensation plan	—		—
Conversion of equity based incentive (EBI) plans	—		—
Grants	149,734		39.55
Released and distributed (vested)	(207,478	)	21.99
Forfeited/expired	(16,150	)	25.45
Balance at end of period	1,140,215		$	21.96