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Long-Term Incentive Compensation Plans:PSU and RSU Awards (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
tranch
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Stock-Based Compensation [Abstract]      
Fair market value of PSUs and RSUs vested | $ $ 12,000 $ 9,200 $ 11,100
Stock-based Compensation Expense | $ 11,870 7,911 7,820
Tax benefit from compensation expense | $ 3,000 2,000 2,000
Unrecognized compensation expense | $ $ 13,800    
Unrecognized Compensation, Period for Recognition 1 year 9 months 18 days    
Performance Shares [Member]      
Stock-Based Compensation [Abstract]      
Stock-based Compensation Expense | $ $ 6,757 $ 4,240 $ 3,795
Number of shares [Abstract]      
Outstanding, December 31, 2021 246,210    
Granted 66,180    
Performance condition adjustment [1] 64,399    
Vested (58,935)    
Forfeited 0    
Outstanding, December 31, 2022 317,854 246,210  
Weighted Average Grant Date Fair Value [Abstract]      
Outstanding, December 31, 2021 | $ / shares $ 39.50    
Granted | $ / shares 79.81 $ 52.45 $ 36.45
Performance condition adjustment | $ / shares [1] 52.45    
Vested | $ / shares 34.41    
Forfeited | $ / shares 0    
Outstanding, December 31, 2022 | $ / shares $ 51.46 $ 39.50  
Performance Shares [Member] | Officer [Member]      
Stock-Based Compensation [Abstract]      
Performance Shares that could be awarded, as a percentage of ROIC target amount, minimum 0.00%    
Performance Shares that could be awarded, as a percentage of ROIC target amount, maximum 200.00%    
Performance Shares Target Percentage Earned, ROIC   200.00% 200.00%
Vesting period (in years) 3 years    
Performance Shares [Member] | Other employees [Member]      
Stock-Based Compensation [Abstract]      
Performance Shares that could be awarded, as a percentage of target amount, minimum 0.00%    
Performance Shares that could be awarded, as a percentage of target amount, maximum 200.00%    
Performance Shares Target Percentage Earned, EBITDA   200.00% 200.00%
Number of equal tranches for annual vesting (in tranches) | tranch 3    
Performance Shares [Member] | Officers and other employees [Member]      
Number of shares [Abstract]      
Granted 66,180 73,265 94,850
Restricted Stock Units (RSUs) [Member]      
Stock-Based Compensation [Abstract]      
Stock-based Compensation Expense | $ $ 5,113 $ 3,671 $ 4,025
Number of shares [Abstract]      
Outstanding, December 31, 2021 161,300    
Granted 86,869 101,059 125,716
Performance condition adjustment 0    
Vested (91,594)    
Forfeited (1,236)    
Outstanding, December 31, 2022 155,339 161,300  
Weighted Average Grant Date Fair Value [Abstract]      
Outstanding, December 31, 2021 | $ / shares $ 45.08    
Granted | $ / shares 79.92 $ 52.95 $ 36.45
Performance condition adjustment | $ / shares 0    
Vested | $ / shares 43.58    
Forfeited | $ / shares 79.83    
Outstanding, December 31, 2022 | $ / shares $ 65.17 $ 45.08  
Restricted Stock Units (RSUs) [Member] | Officers and other employees [Member]      
Stock-Based Compensation [Abstract]      
Number of equal tranches for annual vesting (in tranches) | tranch 3    
Restricted Stock Units (RSUs) [Member] | Nonemployee Directors [Member]      
Stock-Based Compensation [Abstract]      
Vesting period (in years) 1 year    
[1] Represents additional PSUs granted during the year ended December 31, 2022, related to above-target achievement of the 2021 performance condition described above.