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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
--- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Impact of adoption of Accounting Standard Update | ASU 2016-09 | $ 1,290 |  | $ 209 |  |  | $ 1,081 |
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
Stock options exercised | 992 | 1 | 991 |  |  |  |
Contribution from Exterran Corporation | 44,709 |  | 44,709 |  |  |  |
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)
Comprehensive loss |  |  |  |  |  |  |
Net income (loss) | (30,732) |  |  |  |  | (28,607) | (2,125)
Derivative gain, net of reclassifications to earnings | 3,890 |  |  | 1,614 |  |  | 2,276
Amortization of terminated interest rate swaps | 227 |  |  | 227 |  |  |
Merger-related adjustments | 0 |  |  |  |  |  |
Adjustments from other changes in ownership of Partnership | 32 |  |  | 32 |  |  |
Ending balance at Sep. 30, 2017 | 701,450 | 769 | 3,090,785 | 195 | (76,152) | (2,280,268) | (33,879)
Comprehensive loss |  |  |  |  |  |  |
Net income (loss) | (12,683) |  |  |  |  |  |
Derivative gain, net of reclassifications to earnings | 2,076 |  |  |  |  |  |
Amortization of terminated interest rate swaps | 182 |  |  |  |  |  |
Merger-related adjustments | 0 |  |  |  |  |  |
Adjustments from other changes in ownership of Partnership | 32 |  |  |  |  |  |
Ending balance at Sep. 30, 2017 | 701,450 | 769 | 3,090,785 | 195 | (76,152) | (2,280,268) | (33,879)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Impact of adoption of Accounting Standard Update | ASU 2014-09 | 14,666 |  |  |  |  | 14,666 |
Impact of adoption of Accounting Standard Update | ASU 2017-12 | 383 |  |  |  |  | 383 |
Beginning balance at Dec. 31, 2017 | 735,618 | 769 | 3,093,058 | 1,197 | (76,732) | (2,241,243) | (41,431)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Treasury stock purchased | (1,728) |  |  |  | (1,728) |  |
Cash dividends | (41,132) |  |  |  |  | (41,132) |
Shares issued in employee stock purchase plan | 616 | 1 | 615 |  |  |  |
Stock-based compensation, net of forfeitures | 5,318 | 10 | 5,372 |  |  |  | (64)
Stock options exercised | 262 |  | 262 |  |  |  |
Cash distribution to noncontrolling unitholders of the Partnership | (11,766) |  |  |  |  |  | (11,766)
Impact of adoption of ASU 2018-02 |  |  |  | 258 |  | (258) |
Merger-related adjustments | 96,228 | 576 | 54,751 |  |  |  | 40,901
Comprehensive loss |  |  |  |  |  |  |
Net income (loss) | 16,192 |  |  |  |  | 8,095 | 8,097
Derivative gain, net of reclassifications to earnings | 7,241 |  |  | 2,978 |  |  | 4,263
Amortization of terminated interest rate swaps | 230 |  |  | 230 |  |  |
Merger-related adjustments | 5,670 |  |  | 5,670 |  |  | (5,700)
Adjustments from other changes in ownership of Partnership | 0 |  |  |  |  |  |
Ending balance at Sep. 30, 2018 | 827,798 | 1,356 | 3,154,058 | 10,333 | (78,460) | (2,259,489) | 0
Comprehensive loss |  |  |  |  |  |  |
Net income (loss) | 9,974 |  |  |  |  |  |
Derivative gain, net of reclassifications to earnings | 959 |  |  |  |  |  |
Amortization of terminated interest rate swaps | 0 |  |  |  |  |  |
Merger-related adjustments | 0 |  |  |  |  |  |
Adjustments from other changes in ownership of Partnership | 0 |  |  |  |  |  |
Ending balance at Sep. 30, 2018 | $ 827,798 | $ 1,356 | $ 3,154,058 | $ 10,333 | $ (78,460) | $ (2,259,489) | $ 0

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