Share and Unit-Based Plans (Tables)

6 Months Ended

Jun. 30, 2020

Share-based Payment Arrangement [Abstract]

Schedule of LTIP Units Granted

During the six months ended June 30, 2020, the Company granted the following LTIP Units:

Grant Date	Units	Type	Fair Value per LTIP Unit		Vest Date
1/1/2020	154,158	Service-based	$	26.92	12/31/2022
1/1/2020	321,940	Market-indexed	$	27.80	12/31/2022
3/1/2020	39,176	Service-based	$	20.42	2/28/2023
3/1/2020	37,592	Market-indexed	$	21.28	2/28/2023
	552,866

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, 2020	616,219	$	39.04	7,216	$	43.29	199,987	$	43.59
Granted	552,866	26.59		17,836	20.23		247,872	14.24
Vested	(3,408)	66.02		(15,825)	22.32		(100,076)	45.18
Forfeited	(6,714)	39.66		—	—		(399)	59.04
Balance at June 30, 2020	1,158,963	$	33.02	9,227	$	34.67	347,384	$	22.17
(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, 2020	35,565	$	57.32
Granted(2)	1,950	54.34
Exercised	—	—
Balance at June 30, 2020	37,515	$	54.34
(1) Value represents the weighted average exercise price.
(2) Pursuant to the terms of the Company's equity plan, the exercise price
and number of options were adjusted so that the stock dividend paid on
June 3, 2020 had no negative impact on the outstanding stock options
(See Note 14 - Stockholders' Equity).

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 June 30,				For the Six Months Ended June 30,
	2020		2019		2020		2019
LTIP Units	$	3,350	$	2,647	$	6,564	$	6,361
Stock units	694		544		2,896		3,204
Stock options	—		—		—		51
Phantom stock units	166		182		353		422
	$	4,210	$	3,373	$	9,813	$	10,038