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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit | Treasury Stock | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2019 | $ 342,116 |  | $ 1,013 | $ 1,258,859 | $ 27 | $ (946,404) |  | $ 28,621
Balance (in shares) at Dec. 31, 2019 |  |  | 101,288,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Distributions to noncontrolling interest | (15,810) |  | $ 0 | 0 | 0 | 0 |  | (15,810)
Distributions to noncontrolling interest (in shares) |  |  | 0 |  |  |  |  |
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding | 170 |  | $ 0 | 170 | 0 | 0 |  | 0
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding (in shares) |  |  | 32,000 |  |  |  |  |
Stock-based compensation | 435 |  | $ 0 | 435 | 0 | 0 |  | 0
Stock-based compensation (in shares) |  |  | 0 |  |  |  |  |
Net income | 78,952 |  | $ 0 | 0 | 0 | 65,437 |  | 13,515
Net income (in shares) |  |  | 0 |  |  |  |  |
Other comprehensive income | 6 |  | $ 0 | 0 | 6 | 0 |  | 0
Other comprehensive income (in shares) |  |  | 0 |  |  |  |  |
Balance at Mar. 31, 2020 | 405,869 |  | $ 1,013 | 1,259,464 | 33 | (880,967) |  | 26,326
Balance (in shares) at Mar. 31, 2020 |  |  | 101,320,000 |  |  |  |  |
Balance at Dec. 31, 2019 | 342,116 |  | $ 1,013 | 1,258,859 | 27 | (946,404) |  | 28,621
Balance (in shares) at Dec. 31, 2019 |  |  | 101,288,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Net income | 218,798 |  |  |  |  |  |  |
Balance at Sep. 30, 2020 | 534,872 |  | $ 1,014 | 1,260,447 | 0 | (775,905) |  | 49,316
Balance (in shares) at Sep. 30, 2020 |  |  | 101,391,000 |  |  |  |  |
Balance at Mar. 31, 2020 | 405,869 |  | $ 1,013 | 1,259,464 | 33 | (880,967) |  | 26,326
Balance (in shares) at Mar. 31, 2020 |  |  | 101,320,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Distributions to noncontrolling interest | (12,152) |  | $ 0 | 0 | 0 | 0 |  | (12,152)
Distributions to noncontrolling interest (in shares) |  |  | 0 |  |  |  |  |
Equity activity of noncontrolling interest from a consolidated variable interest entity | 350 |  | $ 0 | 0 | 0 | 0 |  | 350
Equity activity of noncontrolling interest from a consolidated variable interest entity (in shares) |  |  | 0 |  |  |  |  |
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding | 180 |  | $ 2 | 178 | 0 | 0 |  | 0
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding (in shares) |  |  | 72,000 |  |  |  |  |
Stock-based compensation | 375 |  | $ 0 | 375 | 0 | 0 |  | 0
Stock-based compensation (in shares) |  |  | 0 |  |  |  |  |
Net income | 98,225 |  | $ 0 | 0 | 0 | 76,844 |  | 21,381
Net income (in shares) |  |  | 0 |  |  |  |  |
Other comprehensive income | (35) |  | $ 0 | 0 | (35) | 0 |  | 0
Other comprehensive income (in shares) |  |  | 0 |  |  |  |  |
Balance at Jun. 30, 2020 | 492,812 |  | $ 1,015 | 1,260,017 | (2) | (804,123) |  | 35,905
Balance (in shares) at Jun. 30, 2020 |  |  | 101,392,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Equity activity of noncontrolling interest from a consolidated variable interest entity | 8 |  | $ 0 | 0 | 0 | 0 |  | 8
Equity activity of noncontrolling interest from a consolidated variable interest entity (in shares) |  |  | 0 |  |  |  |  |
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding | (12) |  | $ (1) | (11) | 0 | 0 |  | 0
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding (in shares) |  |  | (1,000) |  |  |  |  |
Stock-based compensation | 441 |  | $ 0 | 441 | 0 | 0 |  | 0
Stock-based compensation (in shares) |  |  | 0 |  |  |  |  |
Net income | 41,621 |  | $ 0 | 0 | 0 | 28,218 |  | 13,403
Net income (in shares) |  |  | 0 |  |  |  |  |
Other comprehensive income | 2 |  | $ 0 | 0 | 2 | 0 |  | 0
Other comprehensive income (in shares) |  |  | 0 |  |  |  |  |
Balance at Sep. 30, 2020 | 534,872 |  | $ 1,014 | 1,260,447 | 0 | (775,905) |  | 49,316
Balance (in shares) at Sep. 30, 2020 |  |  | 101,391,000 |  |  |  |  |
Balance at Dec. 31, 2020 | $ 607,837 | [1] | $ 1,014 | 1,260,900 | 0 | (722,002) | $ 0 | 67,925
Balance (in shares) at Dec. 31, 2020 | 101,392,000 |  | 101,392,000 |  |  |  | 0 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Distributions to noncontrolling interest | $ (21,285) |  | $ 0 | 0 | 0 | 0 | $ 0 | (21,285)
Distributions to noncontrolling interest (in shares) |  |  | 0 |  |  |  | 0 |
Equity activity of noncontrolling interest from a consolidated variable interest entity | 8 |  | $ 0 | 0 | 0 | 0 | $ 0 | 8
Equity activity of noncontrolling interest from a consolidated variable interest entity (in shares) |  |  | 0 |  |  |  | 0 |
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding | (25) |  | $ 0 | (25) | 0 | 0 | $ 0 | 0
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding (in shares) |  |  | 16,000 |  |  |  | 0 |
Stock-based compensation | 451 |  | $ 0 | 451 | 0 | 0 | $ 0 | 0
Stock-based compensation (in shares) |  |  | 0 |  |  |  | 0 |
Net income | 109,695 |  | $ 0 | 0 | 0 | 94,123 | $ 0 | 15,572
Net income (in shares) |  |  | 0 |  |  |  | 0 |
Balance at Mar. 31, 2021 | 696,681 |  | $ 1,014 | 1,261,326 | 0 | (627,879) | $ 0 | 62,220
Balance (in shares) at Mar. 31, 2021 |  |  | 101,408,000 |  |  |  | 0 |
Balance at Dec. 31, 2020 | $ 607,837 | [1] | $ 1,014 | 1,260,900 | 0 | (722,002) | $ 0 | 67,925
Balance (in shares) at Dec. 31, 2020 | 101,392,000 |  | 101,392,000 |  |  |  | 0 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Net income | $ 323,187 |  |  |  |  |  |  |
Balance at Sep. 30, 2021 | $ 491,805 |  | $ 695 | 1,262,438 | 0 | (466,493) | $ (393,829) | 88,994
Balance (in shares) at Sep. 30, 2021 | 69,492,000 |  | 69,492,000 |  |  |  | 32,005,000 |
Balance at Mar. 31, 2021 | $ 696,681 |  | $ 1,014 | 1,261,326 | 0 | (627,879) | $ 0 | 62,220
Balance (in shares) at Mar. 31, 2021 |  |  | 101,408,000 |  |  |  | 0 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Distributions to noncontrolling interest | (20,161) |  | $ 0 | 0 | 0 | 0 | $ 0 | (20,161)
Distributions to noncontrolling interest (in shares) |  |  | 0 |  |  |  | 0 |
Equity activity of noncontrolling interest from a consolidated variable interest entity | 8 |  | $ 0 | 0 | 0 | 0 | $ 0 | 8
Equity activity of noncontrolling interest from a consolidated variable interest entity (in shares) |  |  | 0 |  |  |  | 0 |
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding | 50 |  | $ 1 | 49 | 0 | 0 | $ 0 | 0
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding (in shares) |  |  | 92,000 |  |  |  | 0 |
Repurchase of common stock | (394,149) |  | $ (320) | 0 | 0 | 0 | $ (393,829) | 0
Repurchase of common stock (in shares) |  |  | (32,005,000) |  |  |  | 32,005,000 |
Stock-based compensation | 470 |  | $ 0 | 470 | 0 | 0 | $ 0 | 0
Stock-based compensation (in shares) |  |  | 0 |  |  |  | 0 |
Net income | 110,846 |  | $ 0 | 0 | 0 | 88,948 | $ 0 | 21,898
Net income (in shares) |  |  | 0 |  |  |  | 0 |
Balance at Jun. 30, 2021 | 393,745 |  | $ 695 | 1,261,845 | 0 | (538,931) | $ (393,829) | 63,965
Balance (in shares) at Jun. 30, 2021 |  |  | 69,495,000 |  |  |  | 32,005,000 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Distributions to noncontrolling interest | (4,912) |  | $ 0 | 0 | 0 | 0 | $ 0 | (4,912)
Distributions to noncontrolling interest (in shares) |  |  | 0 |  |  |  | 0 |
Equity activity of noncontrolling interest from a consolidated variable interest entity | (267) |  | $ 0 | 0 | 0 | 0 | $ 0 | (267)
Equity activity of noncontrolling interest from a consolidated variable interest entity (in shares) |  |  | 0 |  |  |  | 0 |
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding | 51 |  | $ 0 | 51 | 0 | 0 | $ 0 | 0
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding (in shares) |  |  | (3,000) |  |  |  | 0 |
Stock-based compensation | 542 |  | $ 0 | 542 | 0 | 0 | $ 0 | 0
Stock-based compensation (in shares) |  |  | 0 |  |  |  | 0 |
Net income | 102,646 |  | $ 0 | 0 | 0 | 72,438 | $ 0 | 30,208
Net income (in shares) |  |  | 0 |  |  |  | 0 |
Balance at Sep. 30, 2021 | $ 491,805 |  | $ 695 | $ 1,262,438 | $ 0 | $ (466,493) | $ (393,829) | $ 88,994
Balance (in shares) at Sep. 30, 2021 | 69,492,000 |  | 69,492,000 |  |  |  | 32,005,000 |
[1] | Consolidated balance sheet as of December 31, 2020 has been derived from audited consolidated financial statements.

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