Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Restricted Stock Unit Awards

The activity related to our Company’s restricted stock unit awards was as follows:

	Year Ended December 31, 2017
	Number of Awards			Weighted Average Grant Date Fair Value (1)
Nonvested at the beginning of the year		197,422		$	37.24
Granted		35,297		$	56.05
Vested		(59,930	)	$	36.21
Forfeited		(13,250	)	$	39.41
Nonvested at the end of the year		159,539		$	41.60

(1) Fair value is based on the closing price of our common shares on the NASDAQ on the grant date.

Performance-based Equity Awards

The activity related to our Company’s performance-based equity awards was as follows:

	Year Ended December 31, 2017
	Number of Awards			Weighted Average Grant Date Fair Value (1)
Nonvested at the beginning of the year		1,176,742		$	35.85
Granted		253,333		$	55.70
Performance Adjustment		83,071		$	30.49
Vested		(520,285	)	$	30.38
Forfeited		(26,500	)	$	41.60
Nonvested at the end of the year		966,361		$	43.39

(1) Fair value is based on the closing price of our common shares on the NASDAQ on the grant date.