Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Disclosure Of Compensation Related Costs Sharebased 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 June 30, 2018 and 2017:

	Six Months Ended June 30,
	2018					2017
	Restricted Stock Units Outstanding			Weighted Average Grant Date Fair Value		Restricted Stock Units Outstanding			Weighted Average Grant Date Fair Value
Balance at beginning of period (unvested)		1,214,325		$	19.97		1,200,848		$	19.00
Grants		110,466			40.02		97,893			33.88
Released and distributed (vested)		(181,903	)		22.09		(70,819	)		19.00
Forfeited/expired		(7,060	)		21.81		(1,021	)		19.00
Balance at end of period (unvested)		1,135,828		$	21.59		1,226,901		$	19.67