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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit | Noncontrolling Interest | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 1,011 | $ 1,256,267 | $ (3) | $ (1,103,692) | $ 5,469 | $ 159,052 |
Balance (in shares) at Dec. 31, 2018 | 101,098 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding | $ 1 | 253 | 0 | 0 | 0 | 254 |
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding (in shares) | 85 |  |  |  |  |  |
Stock-based compensation | $ 0 | 605 | 0 | 0 | 0 | 605 |
Net income | 0 | 0 | 0 | 33,790 | 6,229 | 40,019 |
Other comprehensive income | 0 | 0 | 13 | 0 | 0 | 13 |
Balance at Mar. 31, 2019 | $ 1,012 | 1,257,125 | 10 | (1,069,902) | 11,698 | 199,943 |
Balance (in shares) at Mar. 31, 2019 | 101,183 |  |  |  |  |  |
Balance at Dec. 31, 2018 | $ 1,011 | 1,256,267 | (3) | (1,103,692) | 5,469 | 159,052 |
Balance (in shares) at Dec. 31, 2018 | 101,098 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  |  |  |  | 86,080 |
Balance at Jun. 30, 2019 | $ 1,013 | 1,257,799 | 33 | (1,032,162) | 20,019 | 246,702 |
Balance (in shares) at Jun. 30, 2019 | 101,272 |  |  |  |  |  |
Balance at Mar. 31, 2019 | $ 1,012 | 1,257,125 | 10 | (1,069,902) | 11,698 | 199,943 |
Balance (in shares) at Mar. 31, 2019 | 101,183 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding | $ 1 | 200 | 0 | 0 | 0 | 201 |
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding (in shares) | 89 |  |  |  |  |  |
Stock-based compensation | $ 0 | 474 | 0 | 0 | 0 | 474 |
Net income | 0 | 0 | 0 | 37,740 | 8,321 | 46,061 |
Other comprehensive income | 0 | 0 | 23 | 0 | 0 | 23 |
Balance at Jun. 30, 2019 | $ 1,013 | 1,257,799 | 33 | (1,032,162) | 20,019 | 246,702 |
Balance (in shares) at Jun. 30, 2019 | 101,272 |  |  |  |  |  |
Balance at Dec. 31, 2019 | $ 1,013 | 1,258,859 | 27 | (946,404) | 28,621 | $ 342,116 | [1]
Balance (in shares) at Dec. 31, 2019 | 101,288 |  |  |  |  | 101,288 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Distributions to noncontrolling interest | $ 0 | 0 | 0 | 0 | (15,810) | $ (15,810) |
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding | $ 0 | 170 | 0 | 0 | 0 | 170 |
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 |  |  |  |  |  |
Stock-based compensation | $ 0 | 435 | 0 | 0 | 0 | 435 |
Net income | 0 | 0 | 0 | 65,437 | 13,515 | 78,952 |
Other comprehensive income | 0 | 0 | 6 | 0 | 0 | 6 |
Balance at Mar. 31, 2020 | $ 1,013 | 1,259,464 | 33 | (880,967) | 26,326 | 405,869 |
Balance (in shares) at Mar. 31, 2020 | 101,320 |  |  |  |  |  |
Balance at Dec. 31, 2019 | $ 1,013 | 1,258,859 | 27 | (946,404) | 28,621 | $ 342,116 | [1]
Balance (in shares) at Dec. 31, 2019 | 101,288 |  |  |  |  | 101,288 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  |  |  |  | $ 177,177 |
Balance at Jun. 30, 2020 | $ 1,015 | 1,260,017 | (2) | (804,123) | 35,905 | $ 492,812 |
Balance (in shares) at Jun. 30, 2020 | 101,392 |  |  |  |  | 101,392 |
Balance at Mar. 31, 2020 | $ 1,013 | 1,259,464 | 33 | (880,967) | 26,326 | $ 405,869 |
Balance (in shares) at Mar. 31, 2020 | 101,320 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Distributions to noncontrolling interest | $ 0 | 0 | 0 | 0 | (12,152) | (12,152) |
Exercise of stock options, and issuance of common stock units and stock awards, net of repurchase of shares to satisfy tax withholding | $ 2 | 178 | 0 | 0 | 0 | 180 |
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 |  |  |  |  |  |
Stock-based compensation | $ 0 | 375 | 0 | 0 | 0 | 375 |
Net income | 0 | 0 | 0 | 76,844 | 21,381 | 98,225 |
Other comprehensive income | 0 | 0 | (35) | 0 | 0 | (35) |
Equity activity of noncontrolling interest from a consolidated variable interest entity | 0 | 0 | 0 | 0 | 350 | 350 |
Balance at Jun. 30, 2020 | $ 1,015 | 1,260,017 | (2) | (804,123) | 35,905 | $ 492,812 |
Balance (in shares) at Jun. 30, 2020 | 101,392 |  |  |  |  | 101,392 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Contributions from noncontrolling interest | $ 0 | $ 0 | $ 0 | $ 0 | $ 350 | $ 350 |
[1] | Consolidated balance sheet as of December 31, 2019 has been derived from audited consolidated financial statements.

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