A summary of activity related to non-vested performance-based restricted share units is presented below (units in thousands):



	Number of Non-vested Performance- Based Share Units		Weighted- Average Grant Date Fair Value Per Share		Weighted- Average Remaining Term in Years	Aggregate Intrinsic Value
Non-vested performance-based share units outstanding at December 31, 2017	303		$	93.65
Granted	207		$	85.01
Vested	(13	)	$	176.59
Forfeited	(55	)	$	85.94
Non-vested performance-based share units outstanding at December 31, 2018	442		$	86.61	1.5	$	17.2
Granted	298		$	47.54
Vested	(68	)	$	116.35
Forfeited	(19	)	$	72.83
Non-vested performance-based share units outstanding at December 31, 2019	653		$	61.44	1.5	$	33.7

Tabular disclosure of the changes in outstanding nonvested performance-based units.

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

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Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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Tabular disclosure of the total intrinsic value of options exercised (or share units converted), share-based liabilities paid, and the total fair value of shares vested during the year.

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Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding performance-based awards that are fully vested and expected to vest. Includes, but is not limited to, unvested awards for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding restricted stock units that are fully vested and expected to vest. Includes, but is not limited to, unvested restricted stock units for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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