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Share and Unit-based Plans (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019, 2018 and 2017:
 201920182017
 UnitsWeighted
Average
Grant Date
Fair Value		UnitsWeighted
Average
Grant Date
Fair Value		UnitsWeighted
Average
Grant Date
Fair Value
Balance at beginning of year129,457  $64.21  151,355  $73.32  148,428  $78.53  
Granted160,932  37.44  87,983  58.79  86,827  66.46  
Vested(85,157) 62.84  (108,991) 74.04  (81,205) 75.62  
Forfeited(5,245) 51.48  (890) 68.81  (2,695) 69.57  
Balance at end of year199,987  $43.59  129,457  $64.21  151,355  $73.32  
Summary of Activity of SARs Awards
The following table summarizes the activity of SARs awards during the years ended December 31, 2019, 2018 and 2017:
 201920182017
 UnitsWeighted
Average
Exercise
Price		UnitsWeighted
Average
Exercise
Price		UnitsWeighted
Average
Exercise
Price
Balance at beginning of year—  $—  235,439  $53.83  284,146  $53.85  
Granted—  —  —  —  —  
Exercised—  —  (235,439) 53.83  (48,707) 53.95  
Balance at end of year—  $—  —  $—  235,439  $53.83  
Schedule of LTIP Units Granted
The Company has granted the following LTIP units during the years ended December 31, 2019, 2018 and 2017:
Grant DateUnitsTypeFair Value per LTIP UnitVest Date
1/1/201766,079  Service-based$70.84  12/31/2019
1/1/2017297,849  Market-indexed$47.15  12/31/2019
3/3/2017134,742  Service-based$66.57  3/3/2017
6/1/20171,522  Service-based$58.31  5/29/2020
6/1/20176,714  Market-indexed$39.66  5/29/2020
506,906  
1/1/201865,466  Service-based$65.68  12/31/2020
1/1/2018291,326  Market-indexed$44.28  12/31/2020
1/29/201813,632  Service-based$66.02  2/1/2022
1/29/20181,893  Service-based$66.02  12/31/2020
1/29/20187,775  Market-indexed$48.23  12/31/2020
3/2/201899,407  Service-based$59.04  3/2/2018
4/26/201889,637  Service-based$55.78  4/26/2018
569,136  
1/1/201981,732  Service-based$43.28  12/31/2021
1/1/2019250,852  Market-indexed$29.25  12/31/2021
9/1/20194,393  Service-based$28.53  8/31/2022
9/1/20196,454  Market-indexed$19.42  8/31/2022
343,431  
Schedule LTIP Units Valuation Assumptions
The fair value of the market-indexed LTIP Units (Level 3) were estimated on the date of grant using a Monte Carlo Simulation model that based on the following assumptions:
Grant DateRisk Free Interest RateExpected Volatility
1/1/20171.49 %20.75 %
6/1/20171.45 %21.40 %
1/1/20181.98 %23.38 %
1/29/20182.25 %23.86 %
1/1/20192.46 %23.52 %
9/1/20191.42 %24.91 %
Summary of Activity of Stock Options
The following table summarizes the activity of the non-vested LTIP Units during the years ended December 31, 2019, 2018 and 2017:
 201920182017
 UnitsWeighted
Average
Grant Date
Fair Value		UnitsWeighted
Average
Grant Date
Fair Value		UnitsWeighted
Average
Grant Date
Fair Value
Balance at beginning of year661,578  $48.38  636,632  $52.36  322,572  $58.18  
Granted343,431  32.40  569,136  51.78  506,906  55.33  
Vested(76,306) 59.27  (253,625) 61.17  (192,846) 69.93  
Forfeited(312,484) 46.55  (290,565) 52.58  —  —  
Balance at end of year616,219  $39.04  661,578  $48.38  636,632  $52.36  
The following table summarizes the activity of stock options for the years ended December 31, 2019, 2018 and 2017:
 201920182017
 OptionsWeighted
Average
Exercise
Price		OptionsWeighted
Average
Exercise
Price		OptionsWeighted
Average
Exercise
Price
Balance at beginning of year35,565  $57.32  35,565  $57.32  10,565  $56.77  
Granted—  —  —  —  25,000  57.55  
Exercised—  —  —  —  —  —  
Balance at end of year35,565  $57.32  35,565  $57.32  35,565  $57.32  
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, 2019, 2018 and 2017:
 201920182017
 Stock UnitsWeighted
Average
Grant Date
Fair Value		Stock UnitsWeighted
Average
Grant Date
Fair Value		Stock UnitsWeighted
Average
Grant Date
Fair Value
Balance at beginning of year—  $—  4,054  $79.82  5,845  $81.47  
Granted23,690  40.26  10,380  49.55  8,760  68.93  
Vested(16,474) 38.94  (12,193) 54.40  (10,551) 71.69  
Forfeited—  —  (2,241) 77.91  —  —  
Balance at end of year7,216  $43.29  —  $—  4,054  $79.82  
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, 2019, 2018 and 2017:
201920182017
Stock units$4,598  $6,355  $6,045  
LTIP units11,372  26,311  30,161  
Stock options51  125  85  
Phantom stock units702  760  714  
$16,723  $33,551  $37,005