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v3.21.2

Summary of Significant Accounting Policies - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Earnings Per Share, Basic [Abstract] |  |  |  |
Net income attributable to common stockholders | $ 25,444 | $ 31,687 | $ 53,402 | $ 41,086
Weighted-Average Shares (in shares) | 10,763,000 | 10,730,000 | 10,751,000 | 10,721,000
Dollars per share (in dollars per share) | $ 2.36 | $ 2.95 | $ 4.96 | $ 3.83
Effect of dilutive securities |  |  |  |
SARs and restricted stock (in shares) | 75,000 | 46,000 | 78,000 | 58,000
SARs and restricted stock (in dollars per share) | $ (0.01) | $ (0.01) | $ (0.03) | $ (0.02)
Net income, Diluted EPS | $ 25,444 | $ 31,687 | $ 53,402 | $ 41,086
Weighted-Average Shares, Diluted EPS (in shares) | 10,838,000 | 10,776,000 | 10,829,000 | 10,779,000
Diluted EPS (in dollars per share) | $ 2.35 | $ 2.94 | $ 4.93 | $ 3.81
Stock Appreciation Rights and Restricted Stock |  |  |  |
Effect of dilutive securities |  |  |  |
Antidilutive securities excluded from earnings per share (in shares) | 29,043 | 83,297 | 64,364 | 85,223
Performance Shares |  |  |  |
Effect of dilutive securities |  |  |  |
Antidilutive securities excluded from earnings per share (in shares) | 18,183 | 12,680 | 18,183 | 12,680

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