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Share and Unit-based Plans (Tables)

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

Summary of Activity of Non-vested Stock Units

The following table summarizes the activity of non-vested stock units during the years ended December 31, 2022, 2021 and 2020:

			2022												2021												2020
			Units						Weighted Average Grant Date Fair Value						Units						Weighted Average Grant Date Fair Value						Units						Weighted Average Grant Date Fair Value
Balance at beginning of year			266,505						$	19.05					309,845						$	21.47					199,987						$	43.59
Granted			209,146						13.43						169,112						14.61						253,184						14.14
Vested			(180,597)						19.84						(211,465)						19.03						(140,224)						39.53
Forfeited			—						—						(987)						22.12						(3,102)						32.62
Balance at end of year			295,054						$	14.58					266,505						$	19.05					309,845						$	21.47

Schedule of LTIP Units Granted

The Company has granted the following LTI units during the years ended December 31, 2022, 2021 and 2020:

Grant Date						Units						Type						Fair Value per LTI 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
1/1/2021						576,378						Service-based						$	10.67					12/31/2023
1/1/2021						1,005,073						Performance-based						$	9.85					12/31/2023
						1,581,451
1/1/2022						376,153						Service-based						$	17.28					12/31/2024
1/1/2022						716,545						Performance-based						$	15.77					12/31/2024
						1,092,698

Schedule LTIP Units Valuation Assumptions

The fair value of the market-indexed LTI Units and performance-based LTI Units (Level 3) were estimated on the date of grant using a Monte Carlo Simulation model that based on the following assumptions:

Grant Date						Risk Free Interest Rate						Expected Volatility
1/1/2020						1.62		%				26.08		%
3/1/2020						0.85		%				28.34		%
1/1/2021						0.17		%				62.82		%
1/1/2022						0.97		%				70.83		%

Summary of Activity of Stock Options

The following table summarizes the activity of the non-vested LTI Units during the years ended December 31, 2022, 2021 and 2020:

			2022												2021												2020
			Units						Weighted Average Grant Date Fair Value						Units						Weighted Average Grant Date Fair Value						Units						Weighted Average Grant Date Fair Value
Balance at beginning of year			1,837,691						$	14.14					784,052						$	28.11					616,219						$	39.04
Granted			1,092,698						16.29						1,581,451						10.15						552,866						26.59
Vested			(386,828)						15.86						(286,373)						17.62						(102,884)						40.19
Forfeited			(328,394)						27.64						(241,439)						29.25						(282,149)						44.28
Balance at end of year			2,215,167						$	12.90					1,837,691						$	14.14					784,052						$	28.11

The following table summarizes the activity of stock options for the years ended December 31, 2022, 2021 and 2020:

			2022												2021												2020
			Options						Weighted Average Exercise Price						Options						Weighted Average Exercise Price						Options						Weighted Average Exercise Price
Balance at beginning of year			37,515						$	54.34					37,515						$	54.34					35,565						$	57.32
Granted(1)			—						—						—						—						1,950						—
Forfeited			(11,144)						$	53.82					—						—						—						—
Balance at end of year			26,371						$	54.56					37,515						$	54.34					37,515						$	54.34

(1)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).

Summary of Activity of Non-vested Phantom Stock Units

The following table summarizes the activity of the non-vested phantom stock units for the years ended December 31, 2022, 2021 and 2020:

			2022												2021												2020
			Stock Units						Weighted Average Grant Date Fair Value						Stock Units						Weighted Average Grant Date Fair Value						Stock Units						Weighted Average Grant Date Fair Value
Balance at beginning of year			—						$	—					4,662						$	35.35					7,216						$	43.29
Granted			61,420						14.35						17,554						12.09						24,576						17.11
Vested			(27,381)						14.55						(22,216)						16.97						(27,130)						20.94
Balance at end of year			34,039						$	14.19					—						$	—					4,662						$	35.35

Compensation Cost Under the Share and Unit-based Plans

The following summarizes the compensation cost under the share and unit-based plans for the years ended December 31, 2022, 2021 and 2019:

        

			2022						2021						2020
Stock units			$	3,110					$	3,173					$	4,159
LTI units			18,611						14,448						13,339
Phantom stock units			398						377						568
			$	22,119					$	17,998					$	18,066

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