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Schedule I - Parent Company Only Financial Statements - Statements of Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues: |  |  |  |  |  |  |  |  |  |  |
Other revenues | $ 3,659 | $ 5,075 | $ 3,758 | $ 4,921 | $ 3,300 | $ 5,288 | $ 4,006 | $ 2,969 | $ 17,413 | $ 15,563 | $ 9,570
Interest and dividend income |  |  |  |  |  |  |  |  | 12,332 | 18,319 | 14,404
Total revenues | 479,426 | 455,039 | 519,088 | 603,167 | 487,156 | 521,137 | 551,187 | 544,751 | 2,056,720 | 2,104,231 | 1,937,810
Expenses: |  |  |  |  |  |  |  |  |  |  |
Interest expense | 21,811 | 19,665 | 17,625 | 17,506 | 16,354 | 15,403 | 15,136 | 13,353 | 76,607 | 60,246 | 42,494
Total expenses | 502,343 | 442,874 | 473,464 | 567,131 | 529,248 | 519,624 | 514,932 | 471,410 | 1,985,812 | 2,035,214 | 1,823,916
Gains (losses) on equity method investments | 1,354 | 1,527 | 1,119 | 1,023 | 1,064 | 1,530 | 738 | 783 | 5,023 | 4,115 | 7,377
Provision (benefit) for income taxes | (6,729) | 8,558 | 8,599 | 10,875 | 4,075 | 6,691 | 13,261 | 25,784 | 21,303 | 49,811 | 63,768
Net income (loss) available to common stockholders | $ (2,338) | $ 9,653 | $ 27,919 | $ 13,674 | $ (20,561) | $ (6,305) | $ 13,972 | $ 60,456 | 48,908 | 47,562 | 202,196
Basic earnings (loss) per share from continuing operations |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations available to common stockholders |  |  |  |  |  |  |  |  | $ 48,908 | $ 47,562 | $ 76,855
Basic earnings (loss) per share from continuing operations |  |  |  |  |  |  |  |  | $ 0.14 | $ 0.14 | $ 0.24
Basic weighted-average shares of common stock outstanding | 365,259 | 363,244 | 360,614 | 358,001 | 351,431 | 346,060 | 341,272 | 338,403 | 361,736 | 344,332 | 322,141
Fully diluted earnings (loss) per share |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations for fully diluted shares |  |  |  |  |  |  |  |  | $ 70,430 | $ 62,054 | $ 76,855
Fully diluted earnings (loss) per share from continuing operations |  |  |  |  |  |  |  |  | $ 0.13 | $ 0.13 | $ 0.24
Fully diluted weighted-average shares of common stock outstanding |  |  |  |  |  |  |  |  | 546,848 | 459,743 | 323,844
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Other revenues |  |  |  |  |  |  |  |  | $ 450 |  | $ 36,944
Interest and dividend income |  |  |  |  |  |  |  |  | 65,762 | $ 55,044 | 68,382
Total revenues |  |  |  |  |  |  |  |  | 66,212 | 55,044 | 105,326
Expenses: |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 65,762 | 55,044 | 68,382
Total expenses |  |  |  |  |  |  |  |  | 65,762 | 55,044 | 68,382
Income from operations before income taxes |  |  |  |  |  |  |  |  | 450 |  | 36,944
Gains (losses) on equity method investments |  |  |  |  |  |  |  |  | 41,876 | 50,413 | 49,087
Equity income of discontinued operations, net |  |  |  |  |  |  |  |  |  |  | 125,341
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | (6,582) | 2,851 | 9,176
Net income (loss) available to common stockholders |  |  |  |  |  |  |  |  | 48,908 | 47,562 | 202,196
Basic earnings (loss) per share from continuing operations |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations available to common stockholders |  |  |  |  |  |  |  |  | $ 48,908 | $ 47,562 | $ 76,855
Basic earnings (loss) per share from continuing operations |  |  |  |  |  |  |  |  | $ 0.14 | $ 0.14 | $ 0.24
Basic weighted-average shares of common stock outstanding |  |  |  |  |  |  |  |  | 361,736 | 344,332 | 322,141
Fully diluted earnings (loss) per share |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations for fully diluted shares |  |  |  |  |  |  |  |  | $ 70,430 | $ 62,054 | $ 76,855
Fully diluted earnings (loss) per share from continuing operations |  |  |  |  |  |  |  |  | $ 0.13 | $ 0.13 | $ 0.24
Fully diluted weighted-average shares of common stock outstanding |  |  |  |  |  |  |  |  | 546,848 | 459,743 | 323,844

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