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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Treasury Stock | Accumulated Deficit | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2014 | $ 1,865,806 | $ 738 | $ 3,715,586 | $ 25,834 | $ (68,532) | $ (1,963,605) | $ 155,785
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Treasury stock purchased | (3,736) |  |  |  | (3,736) |  |
Options exercised | 1,005 | 1 | 1,004 |  |  |  |
Cash dividends | (20,743) |  |  |  |  | (20,743) |
Shares issued in employee stock purchase plan | 910 |  | 910 |  |  |  |
Stock-based compensation, net of forfeitures | 9,722 | 6 | 9,195 |  |  |  | 521
Income tax expense from stock-based compensation expense | 569 |  | 569 |  |  |  |
Adjustments from changes in ownership of Partnership | (9,972) |  | 17,662 |  |  |  | (27,634)
Net proceeds from the sale of Partnership units, net of tax | 1,268 |  | 1,268 |  |  |  |
Contribution from Exterran Corporation | 0 |  |  |  |  |  |
Cash distribution to noncontrolling unitholders of the Partnership | (40,491) |  |  |  |  |  | (40,491)
Shares issued for exercise of warrants | 0 |  | (88) |  | 88 |  |
Comprehensive income (loss) (As Restated) (Note 17) | 18,326 |  |  | (5,333) |  | 6,851 | 16,808
Ending balance at Jun. 30, 2015 | 1,822,664 | 745 | 3,746,106 | 20,501 | (72,180) | (1,977,497) | 104,989
Beginning balance at Dec. 31, 2015 | 787,259 | 750 | 2,944,897 | (1,570) | (72,429) | (2,137,738) | 53,349
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Treasury stock purchased | (749) |  |  |  | (749) |  |
Cash dividends | (19,763) |  |  |  |  | (19,763) |
Stock-based compensation, net of forfeitures | 5,776 | 12 | 5,078 |  |  |  | 686
Income tax expense from stock-based compensation expense | (1,057) |  | (1,057) |  |  |  |
Contribution from Exterran Corporation | 29,662 |  | 29,662 |  |  |  |
Partnership units issued in March 2016 Acquisition | 1,469 |  | 585 |  |  |  | 884
Cash distribution to noncontrolling unitholders of the Partnership | (31,183) |  |  |  |  |  | (31,183)
Comprehensive income (loss) (As Restated) (Note 17) | (15,322) |  |  | (2,011) |  | (6,296) | (7,015)
Ending balance at Jun. 30, 2016 | $ 756,092 | $ 762 | $ 2,979,165 | $ (3,581) | $ (73,178) | $ (2,163,797) | $ 16,721

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