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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Common Stock | Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Cost of Common Stock in Treasury | Cost of Common Stock in Treasury Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accumulated Other Comprehensive Income (Loss), Net | Accumulated Other Comprehensive Income (Loss), Net Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Other Comprehensive Income (Loss), Net Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Total Shareholders' Equity | Total Shareholders' Equity Cumulative Effect, Period of Adoption, Adjustment [Member] | Total Shareholders' Equity Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Noncontrolling Interests | Noncontrolling Interests Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 718,537 | $ 0 | $ 718,537 | $ 436,538 | $ 436,538 | $ 339,959 | $ 718 | $ 340,677 | $ (54,628) | $ (54,628) | $ (3,332) | $ (718) | $ (4,050) | $ 718,537 | $ 0 | $ 718,537 | $ 0 | $ 0
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 82,414 |  |  |  |  | 82,414 |  |  |  |  |  |  |  | 82,414 |  |  |  |
Other comprehensive income (loss) | (6,626) |  |  |  |  |  |  |  |  |  | (6,626) |  |  | (6,626) |  |  |  |
Issuance of 46,089, 51,533, and 47,977 common shares under stock based compensation awards for 2020, 2019 and 2018, respectively | 1,980 |  |  |  |  | 841 |  |  | 1,139 |  |  |  |  | 1,980 |  |  |  |
Cost of 166,446, 325,787, and 201,013 shares of common stock acquired for treasury for 2020, 2019 and 2018, respectively | (9,271) |  |  |  |  |  |  |  | (9,271) |  |  |  |  | (9,271) |  |  |  |
Common stock dividend ($1.13, $1.10, and $0.96 per share for 2020, 2019 and 2018, respectively) | (24,952) |  |  |  |  | (24,952) |  |  |  |  |  |  |  | (24,952) |  |  |  |
Contributions from noncontrolling interests | 1,508 |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 1,508 |
Balance at Dec. 31, 2018 | $ 763,590 | (301) | 763,289 | 436,538 | 436,538 | 398,980 | (301) | 398,679 | (62,760) | (62,760) | (10,676) |  | (10,676) | 762,082 | (301) | 761,781 | 1,508 | 1,508
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares per stock based compensation awards, shares | 47,977 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock acquired for treasury, shares | 201,013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividend (in dollars per share) | $ 0.96 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 92,015 |  |  |  |  | 91,960 |  |  |  |  |  |  |  | 91,960 |  |  | 55 |
Other comprehensive income (loss) | 15,848 |  |  |  |  |  |  |  |  |  | 15,848 |  |  | 15,848 |  |  |  |
Issuance of 46,089, 51,533, and 47,977 common shares under stock based compensation awards for 2020, 2019 and 2018, respectively | 2,005 |  |  |  |  | 862 |  |  | 1,143 |  |  |  |  | 2,005 |  |  |  |
Cost of 166,446, 325,787, and 201,013 shares of common stock acquired for treasury for 2020, 2019 and 2018, respectively | (15,085) |  |  |  |  |  |  |  | (15,085) |  |  |  |  | (15,085) |  |  |  |
Common stock dividend ($1.13, $1.10, and $0.96 per share for 2020, 2019 and 2018, respectively) | (28,232) |  |  |  |  | (28,232) |  |  |  |  |  |  |  | (28,232) |  |  |  |
Contributions from noncontrolling interests | 18,934 |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 18,934 |
Distributions to noncontrolling interests | (138) |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | (138) |
Balance at Dec. 31, 2019 | $ 848,636 | $ (2,552) | $ 846,084 | 436,538 | $ 436,538 | 463,269 | $ (2,552) | $ 460,717 | (76,702) | $ (76,702) | 5,172 |  | $ 5,172 | 828,277 | $ (2,552) | $ 825,725 | 20,359 | $ 20,359
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares per stock based compensation awards, shares | 51,533 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock acquired for treasury, shares | 325,787 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividend (in dollars per share) | $ 1.10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 81,461 |  |  |  |  | 81,437 |  |  |  |  |  |  |  | 81,437 |  |  | 24 |
Other comprehensive income (loss) | 13,199 |  |  |  |  |  |  |  |  |  | 13,199 |  |  | 13,199 |  |  |  |
Issuance of 46,089, 51,533, and 47,977 common shares under stock based compensation awards for 2020, 2019 and 2018, respectively | 1,839 |  |  |  |  | 962 |  |  | 877 |  |  |  |  | 1,839 |  |  |  |
Cost of 166,446, 325,787, and 201,013 shares of common stock acquired for treasury for 2020, 2019 and 2018, respectively | (6,415) |  |  |  |  |  |  |  | (6,415) |  |  |  |  | (6,415) |  |  |  |
Common stock dividend ($1.13, $1.10, and $0.96 per share for 2020, 2019 and 2018, respectively) | (28,940) |  |  |  |  | (28,940) |  |  |  |  |  |  |  | (28,940) |  |  |  |
Contributions from noncontrolling interests | 24,098 |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 24,098 |
Distributions to noncontrolling interests | (656) |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | (656) |
Balance at Dec. 31, 2020 | $ 930,670 |  |  | $ 436,538 |  | $ 514,176 |  |  | $ (82,240) |  | $ 18,371 |  |  | $ 886,845 |  |  | $ 43,825 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares per stock based compensation awards, shares | 46,089 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock acquired for treasury, shares | 166,446 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividend (in dollars per share) | $ 1.13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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