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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, 2015 | $ 787,259 | $ 750 | $ 2,944,897 | $ (1,570) | $ (72,429) | $ (2,137,738) | $ 53,349
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Treasury stock purchased | (960) |  |  |  | (960) |  |
Cash dividends | (26,462) |  |  |  |  | (26,462) |
Stock-based compensation, net of forfeitures | 8,446 | 12 | 7,467 |  |  |  | 967
Income tax expense from stock-based compensation expense | (992) |  | (992) |  |  |  |
Contribution from Exterran Corporation | 49,015 |  | 49,015 |  |  |  |
Partnership units issued in March 2016 Acquisition | 1,469 |  | 585 |  |  |  | 884
Cash distribution to noncontrolling unitholders of the Partnership | (41,626) |  |  |  |  |  | (41,626)
Comprehensive income (loss) | (22,614) |  |  | (1,138) |  | (15,944) | (5,532)
Ending balance at Sep. 30, 2016 | 753,535 | 762 | 3,000,972 | (2,708) | (73,389) | (2,180,144) | 8,042
Beginning balance at Dec. 31, 2016 | 684,928 | 762 | 3,021,040 | (1,678) | (73,944) | (2,227,214) | (34,038)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Treasury stock purchased | (2,208) |  |  |  | (2,208) |  |
Cash dividends | (25,528) |  |  |  |  | (25,528) |
Shares issued in employee stock purchase plan | 195 |  | 195 |  |  |  |
Stock-based compensation, net of forfeitures | 6,607 | 6 | 6,003 |  |  |  | 598
Contribution from Exterran Corporation | 44,709 |  | 44,709 |  |  |  |
Stock options exercised | 992 | 1 | 991 |  |  |  |
Net proceeds from sale of Partnership units, net of tax | 49,726 |  | 17,638 |  |  |  | 32,088
Cash distribution to noncontrolling unitholders of the Partnership | (32,678) |  |  |  |  |  | (32,678)
Impact of adoption of ASU 2016-09 | 1,290 |  | 209 |  |  | 1,081 |
Comprehensive income (loss) | (26,583) |  |  | 1,873 |  | (28,607) | 151
Ending balance at Sep. 30, 2017 | $ 701,450 | $ 769 | $ 3,090,785 | $ 195 | $ (76,152) | $ (2,280,268) | $ (33,879)

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