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CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands | Parent | Common Stock | Capital in Excess of Par Value | Cumulative Net Income | Cumulative Distributions | Non-controlling Interests | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2019 | $ 776,943 | $ 398 | $ 867,346 | $ 1,293,482 | $ (1,384,283) | $ 8,483 | $ 785,426
Balance (in shares) at Dec. 31, 2019 |  | 39,752 |  |  |  |  |
Equity activity |  |  |  |  |  |  |
Common stock cash distributions | (22,581) |  |  |  | (22,581) |  | (22,581)
Vesting of performance-based stock units, including the payment of distributions | (586) |  |  |  | (586) |  | (586)
Vesting of performance-based stock units, including the payment of distributions (in shares) |  | 82 |  |  |  |  |
Issuance of restricted stock |  | $ 1 | (1) |  |  |  |
Issuance of restricted stock (in shares) |  | 76 |  |  |  |  |
Repurchase of common stock | (18,012) | $ (6) | (18,006) |  |  |  | (18,012)
Repurchase of common stock (in shares) |  | (616) |  |  |  |  |
Stock-based compensation expense | 1,777 |  | 1,777 |  |  |  | 1,777
Net income | 63,633 |  |  | 63,633 |  | 89 | 63,722
Non-controlling interest distributions |  |  |  |  |  | (146) | (146)
Other | (3,545) | $ (1) | (3,544) |  |  |  | (3,545)
Other (in shares) |  | (76) |  |  |  |  |
Balance at end of period at Mar. 31, 2020 | 797,629 | $ 392 | 847,572 | 1,357,115 | (1,407,450) | 8,426 | 806,055
Balance (in shares) at Mar. 31, 2020 |  | 39,218 |  |  |  |  |
Equity activity |  |  |  |  |  |  |
Common stock cash distributions | (22,359) |  |  |  | (22,359) |  | (22,359)
Issuance of restricted stock | (7) |  | (7) |  |  |  | (7)
Issuance of restricted stock (in shares) |  | 25 |  |  |  |  |
Stock-based compensation expense | 1,761 |  | 1,761 |  |  |  | 1,761
Net income | 1,870 |  |  | 1,870 |  | 82 | 1,952
Non-controlling interest distributions |  |  |  |  |  | (97) | (97)
Balance at end of period at Jun. 30, 2020 | 778,894 | $ 392 | 849,326 | 1,358,985 | (1,429,809) | 8,411 | 787,305
Balance (in shares) at Jun. 30, 2020 |  | 39,243 |  |  |  |  |
Equity activity |  |  |  |  |  |  |
Common stock cash distributions | (22,368) |  |  |  | (22,368) |  | (22,368)
Stock-based compensation expense | 1,693 |  | 1,693 |  |  |  | 1,693
Net income | 12,217 |  |  | 12,217 |  | 121 | 12,338
Non-controlling interest distributions |  |  |  |  |  | (128) | (128)
Other | (19) |  | (19) |  |  |  | (19)
Other (in shares) |  | (1) |  |  |  |  |
Balance at end of period at Sep. 30, 2020 | 770,417 | $ 392 | 851,000 | 1,371,202 | (1,452,177) | 8,404 | 778,821
Balance (in shares) at Sep. 30, 2020 |  | 39,242 |  |  |  |  |
Equity activity |  |  |  |  |  |  |
Common stock cash distributions | (22,368) |  |  |  | (22,368) |  | (22,368)
Issuance of restricted stock | (1) |  | (1) |  |  |  | (1)
Stock-based compensation expense | 1,781 |  | 1,781 |  |  |  | 1,781
Net income | 17,573 |  |  | 17,573 |  | 92 | 17,665
Non-controlling interest distributions |  |  |  |  |  | (92) | (92)
Balance at end of period at Dec. 31, 2020 | 767,402 | $ 392 | 852,780 | 1,388,775 | (1,474,545) | 8,404 | 775,806
Balance (in shares) at Dec. 31, 2020 |  | 39,242 |  |  |  |  |
Equity activity |  |  |  |  |  |  |
Common stock cash distributions | (22,405) |  |  |  | (22,405) |  | (22,405)
Vesting of performance-based stock units, including the payment of distributions | (764) | $ 1 | (1) |  | (764) |  | (764)
Vesting of performance-based stock units, including the payment of distributions (in shares) |  | 109 |  |  |  |  |
Stock-based compensation expense | 1,852 |  | 1,852 |  |  |  | 1,852
Net income | 13,762 |  |  | 13,762 |  | 88 | 13,850
Non-controlling interest distributions |  |  |  |  |  | (88) | (88)
Cash paid for taxes in lieu of common shares | (3,470) |  | (3,470) |  |  |  | (3,470)
Cash paid for taxes in lieu of common shares (in shares) |  | (84) |  |  |  |  |
Other | (10) | $ 1 | (11) |  |  |  | (10)
Other (in shares) |  | 95 |  |  |  |  |
Balance at end of period at Mar. 31, 2021 | $ 756,367 | $ 394 | $ 851,150 | $ 1,402,537 | $ (1,497,714) | $ 8,404 | $ 764,771
Balance (in shares) at Mar. 31, 2021 |  | 39,362 |  |  |  |  |

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