Share Based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Restricted Share

	Six Months Ended June 30, 2019
				Weighted-
				Average Grant
	Shares			Date Fair Value
Unvested restricted shares at beginning of period		403,129		$	41.57
Share units granted		76,948			57.04
Restricted shares vested		(121,205	)		41.80
Restricted shares forfeited		(2,882	)		44.80
Unvested restricted shares at end of period		355,990			44.81