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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Basic EPS      
Net income attributable to common stockholders $ 180,428 $ 172,838 $ 150,979
Net income attributable to common stockholders (in shares) 10,874,000 10,829,000 10,791,000
Net income attributable to common stockholders (in dollars per share) $ 16.59 $ 15.97 $ 14.00
Effect of dilutive securities      
SARs and restricted stock units (in shares) 101,000 108,000 92,000
SARs and restricted stock units (in dollars per share) $ (0.15) $ (0.16) $ (0.13)
Net income, diluted EPS $ 180,428 $ 172,838 $ 150,979
Weighted-Average Shares, diluted EPS (in shares) 10,975,000 10,937,000 10,883,000
Diluted EPS (in dollars per share) $ 16.44 $ 15.81 $ 13.87
Stock Appreciation Rights and Restricted Stock      
Effect of dilutive securities      
Antidilutive securities excluded from earnings per share (in shares) 30,891 32,683 32,448
Performance Shares      
Effect of dilutive securities      
Antidilutive securities excluded from earnings per share (in shares) 28,670 30,648 18,535