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Long-Term Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Performance Award Valuation Assumptions The fair values were determined by a lattice-binomial option-pricing model based on Monte Carlo simulations using the following assumptions:
Year Ended December 31, 2021Year Ended December 31, 2020Year Ended December 31, 2019
Expected dividend yield2.49 %2.22 %3.02 %
Expected volatility - range used
29.00% - 37.18%
16.25% - 17.56%
18.53% - 19.72%
Expected volatility - weighted average32.44 %16.97 %19.10 %
Risk-free interest rate
0.02% - 0.19%
1.63% - 1.68%
2.45% - 2.57%
Summary of Performance Award Transactions
Performance Award transactions for the year ended December 31, 2021 are summarized as follows:
Performance UnitsWeighted
Average
Grant Date
Fair Value		Performance RLP UnitsWeighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2020256,093 $14.86 479,179 $17.97 
Issued58,568 $22.23 263,621 $22.23 
Forfeited(8,118)$18.96 (11,362)$20.65 
Vested(164,045)$13.28 (7,013)$20.65 
Outstanding at December 31, 2021142,498 $19.47 724,425 $19.45 
Summary of Service Award Transactions Service Award transactions for the year ended December 31, 2021 are summarized as follows:
Service UnitsWeighted
Average
Grant Date
Fair Value		Service RLP UnitsWeighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2020211,920 $36.35 184,569 $39.62 
Issued67,127 $43.64 51,525 $43.96 
Forfeited(2,508)$41.59 — $— 
Vested(128,602)$33.60 (77,925)$38.49 
Outstanding at December 31, 2021147,937 $41.95 158,169 $41.60