Share and Unit-Based Plans (Tables)

3 Months Ended

Mar. 31, 2019

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

Schedule of LTIP Units Granted

During the three months endedMarch 31, 2019, the Company granted the following LTIP Units:

Grant Date	Units	Type	Fair Value per LTIP Unit		Vest Date
1/1/2019	81,732	Service-based	$	43.28	12/31/2021
1/1/2019	250,852	Market-indexed	$	29.25	12/31/2021
	332,584

Summary of activity of non-vested LTIP Units, stock awards, phantom stock and stock units

The following table summarizes the activity of the non-vested LTIP Units, phantom stock units and stock units:

	LTIP Units				Phantom Stock Units				Stock Units
	Units		Value(1)		Units		Value(1)		Units		Value(1)
Balance at January 1, 2019	661,578		$	48.38	—		$	—	129,457		$	64.21
Granted	332,584		32.70		18,315		43.13		89,505		42.00
Vested	(7,654	)	59.85		(3,934	)	45.55		(80,954	)	64.53
Forfeited	(14,635	)	34.26		—		—		—		—
Balance at March 31, 2019	971,873		$	43.13	14,381		$	42.46	138,008		$	49.62
(1) Value represents the weighted average grant date fair value.

Summary of activity of SARs and stock options outstanding

The following table summarizes the activity of the stock options outstanding:

	Stock Options
	Units	Value(1)
Balance at January 1, 2019	35,565	$	57.32
Granted	—	—
Exercised	—	—
Balance at March 31, 2019	35,565	$	57.32
(1) Value represents the weighted average exercise price.

Compensation cost under the share and unit-based plans

The following summarizes the compensation cost under the share and unit-based plans:

	For the Three Months Ended March 31,
	2019		2018
LTIP Units	$	3,714	$	10,108
Stock units	2,660		3,230
Stock options	51		31
Phantom stock units	240		243
	$	6,665	$	13,612