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Consolidated Statements of Equity - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock Common Stock | Common Stock Exchangeable Shares | Preferred Stock Series G | Additional Paid-in Capital | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Loss | Treasury Stock | Total Stockholders' Equity | Total Stockholders' Equity Cumulative Effect, Period of Adoption, Adjustment | Non-controlling Interests
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2017 |  |  | 153,342,326 | 486,112 | 1 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2017 | $ 3,795,629 | $ (1,276) | $ 2 | $ 0 | $ 0 | $ 1,889,356 | $ 2,191,059 | $ (1,276) | $ (203,395) | $ (85,451) | $ 3,791,571 | $ (1,276) | $ 4,058
Other comprehensive income (loss) | (82,653) |  |  |  |  |  |  |  | (82,653) |  | (82,653) |  |
Acquisitions (in shares) |  |  | 679,668 |  |  |  |  |  |  |  |  |  |
Acquisitions | 22,882 |  |  |  |  | 22,882 |  |  |  |  | 22,882 |  |
Stock-based compensation activity (in shares) |  |  | 998,631 |  |  |  |  |  |  |  |  |  |
Stock-based compensation activity | 37,417 |  |  |  |  | 55,116 |  |  |  | (17,699) | 37,417 |  |
Common stock repurchases (in shares) |  |  | (13,916,725) |  |  |  |  |  |  |  |  |  |
Common stock repurchases | (451,290) |  |  |  |  |  |  |  |  | (451,290) | (451,290) |  |
Dividend declared | (5,838) |  |  |  |  |  | (5,838) |  |  |  | (5,838) |  |
Distributions to non-controlling interests | (4,038) |  |  |  |  |  |  |  |  |  |  |  | (4,038)
Buyout of non-controlling interest | (1,387) |  |  |  |  |  |  |  |  |  |  |  | (1,387)
Net income | 296,007 |  |  |  |  |  | 293,346 |  |  |  | 293,346 |  | 2,661
Balance (in shares) at Dec. 31, 2018 |  |  | 141,103,900 | 486,112 | 1 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2018 | 3,605,453 |  | $ 2 | $ 0 | $ 0 | 1,967,354 | 2,477,291 |  | (286,048) | (554,440) | 3,604,159 |  | 1,294
Other comprehensive income (loss) | 44,230 |  |  |  |  |  |  |  | 44,230 |  | 44,230 |  |
Acquisitions (in shares) |  |  | 60,860 |  |  |  |  |  |  |  |  |  |
Acquisitions | 1,791 |  |  |  |  | 1,791 |  |  |  |  | 1,791 |  |
Stock-based compensation activity (in shares) |  |  | 1,085,165 |  |  |  |  |  |  |  |  |  |
Stock-based compensation activity | 35,086 |  |  |  |  | 55,465 |  |  |  | (20,379) | 35,086 |  |
Exchange of exchangeable shares (in shares) |  |  | 449,929 | (449,929) |  |  |  |  |  |  |  |  |
Retirement of preferred stock (in shares) |  |  |  |  | (1) |  |  |  |  |  |  |  |
Common stock repurchases (in shares) |  |  | (375,536) |  |  |  |  |  |  |  |  |  |
Common stock repurchases | (11,954) |  |  |  |  |  |  |  |  | (11,954) | (11,954) |  |
Dividend declared | (25,064) |  |  |  |  |  | (25,064) |  |  |  | (25,064) |  |
Distributions to non-controlling interests | (2,526) |  |  |  |  |  |  |  |  |  |  |  | (2,526)
Net income | 406,815 |  |  |  |  |  | 402,044 |  |  |  | 402,044 |  | 4,771
Balance (in shares) at Dec. 31, 2019 |  |  | 142,324,318 | 36,183 | 0 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2019 | 4,053,831 | $ (3,841) | $ 2 | $ 0 | $ 0 | 2,024,610 | 2,854,271 | $ (3,841) | (241,818) | (586,773) | 4,050,292 | $ (3,841) | 3,539
Other comprehensive income (loss) | 8,821 |  |  |  |  |  |  |  | 8,821 |  | 8,821 |  |
Acquisitions (in shares) |  |  | 1,338,746 |  |  |  |  |  |  |  |  |  |
Acquisitions | 57,289 |  |  |  |  | 57,289 |  |  |  |  | 57,289 |  |
Stock-based compensation activity (in shares) |  |  | 1,280,489 |  |  |  |  |  |  |  |  |  |
Stock-based compensation activity | 67,032 |  |  |  |  | 88,127 |  |  |  | (21,095) | 67,032 |  |
Exchange of exchangeable shares (in shares) |  |  | 36,183 | (36,183) |  |  |  |  |  |  |  |  |
Common stock repurchases (in shares) |  |  | (6,679,545) |  |  |  |  |  |  |  |  |  |
Common stock repurchases | (249,949) |  |  |  |  |  |  |  |  | (249,949) | (249,949) |  |
Dividend declared | (30,543) |  |  |  |  |  | (30,543) |  |  |  | (30,543) |  |
Distributions to non-controlling interests | (5,404) |  |  |  |  |  |  |  |  |  |  |  | (5,404)
Other | (223) |  |  |  |  |  | (516) |  |  |  | (516) |  | 293
Net income | 451,959 |  |  |  |  |  | 445,596 |  |  |  | 445,596 |  | 6,363
Balance (in shares) at Dec. 31, 2020 |  |  | 138,300,191 | 0 | 0 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2020 | $ 4,348,972 |  | $ 2 | $ 0 | $ 0 | $ 2,170,026 | $ 3,264,967 |  | $ (232,997) | $ (857,817) | $ 4,344,181 |  | $ 4,791

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