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Share and Unit-Based Plans (Tables)
9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of LTIP units granted
During the nine months ended September 30, 2020, the Company granted the following LTIP Units:
Grant DateUnitsTypeFair Value per LTIP UnitVest Date
1/1/2020154,158 Service-based$26.92 12/31/2022
1/1/2020321,940 Market-indexed$27.80 12/31/2022
3/1/202039,176 Service-based$20.42 2/28/2023
3/1/202037,592 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 UnitsPhantom Stock UnitsStock Units
 UnitsValue(1)UnitsValue(1)UnitsValue(1)
Balance at January 1, 2020616,219 $39.04 7,216 $43.29 199,987 $43.59 
Granted552,866 26.59 23,222 17.46 250,889 14.17 
Vested(4,872)54.75 (20,948)20.90 (111,856)42.89 
Forfeited(6,714)39.66 — — (3,102)32.62 
Balance at September 30, 20201,157,499 $33.03 9,490 $29.51 335,918 $21.95 
(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
 UnitsValue(1)
Balance at January 1, 202035,565 $57.32 
Granted(2)1,950 54.34 
Exercised— — 
Balance at September 30, 202037,515 $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 September 30,For the Nine Months Ended September 30,
 2020201920202019
LTIP Units$3,354 $2,498 $9,918 $8,859 
Stock units684 632 3,580 3,836 
Stock options— — — 51 
Phantom stock units85 185 438 607 
$4,123 $3,315 $13,936 $13,353