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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit | Treasury Stock | ATM Agreement | Cumulative Effect, Period of Adoption, Adjustment | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2019 | $ 1,587 | $ 3,412,509 | $ (1,387) | $ 166 | $ (2,244,877) | $ (81,869) |  | $ 166 | $ 1,085,963
Stockholders' Equity, Beginning, shares at Dec. 31, 2019 | 158,636,918 |  |  |  |  | (6,702,602) |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Treasury stock purchased |  |  |  |  |  | $ (1,794) |  |  | (1,794)
Treasury stock purchased, shares |  |  |  |  |  | (235,079) |  |  |
Cash dividends |  |  |  |  | (66,655) |  |  |  | (66,655)
Shares issued under ESPP | $ 1 | 521 |  |  |  |  |  |  | 522
Shares issued under ESPP (in shares) | 140,606 |  |  |  |  |  |  |  |
Stock-based compensation, net of forfeitures | $ 11 | 8,616 |  |  |  |  |  |  | 8,627
Stock-based compensation, net of forfeitures, shares | 1,193,832 |  |  |  |  | (64,483) |  |  |
Contribution from Exterran Corporation |  | 678 |  |  |  |  |  |  | 678
Comprehensive income (loss) |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | (73,236) |  |  |  | (73,236)
Interest rate swap gain (loss), net of reclassifications to earnings |  |  | (4,586) |  |  |  |  |  | (4,586)
Ending balance at Sep. 30, 2020 | $ 1,599 | 3,422,324 | (5,973) |  | (2,384,602) | $ (83,663) |  |  | 949,685
Stockholders' Equity, Ending, shares at Sep. 30, 2020 | 159,971,356 |  |  |  |  | (7,002,164) |  |  |
Beginning balance at Jun. 30, 2020 | $ 1,598 | 3,419,512 | (6,908) |  | (2,380,626) | $ (82,703) |  |  | 950,873
Stockholders' Equity, Beginning, shares at Jun. 30, 2020 | 159,810,336 |  |  |  |  | (6,860,984) |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Treasury stock purchased |  |  |  |  |  | $ (960) |  |  | (960)
Treasury stock purchased, shares |  |  |  |  |  | (138,922) |  |  |
Cash dividends |  |  |  |  | (22,308) |  |  |  | (22,308)
Shares issued under ESPP |  | 155 |  |  |  |  |  |  | 155
Shares issued under ESPP (in shares) | 30,351 |  |  |  |  |  |  |  |
Stock-based compensation, net of forfeitures | $ 1 | 2,657 |  |  |  |  |  |  | 2,658
Stock-based compensation, net of forfeitures, shares | 130,669 |  |  |  |  | (2,258) |  |  |
Comprehensive income (loss) |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 18,332 |  |  |  | 18,332
Interest rate swap gain (loss), net of reclassifications to earnings |  |  | 935 |  |  |  |  |  | 935
Ending balance at Sep. 30, 2020 | $ 1,599 | 3,422,324 | (5,973) |  | (2,384,602) | $ (83,663) |  |  | 949,685
Stockholders' Equity, Ending, shares at Sep. 30, 2020 | 159,971,356 |  |  |  |  | (7,002,164) |  |  |
Beginning balance at Dec. 31, 2020 | $ 1,600 | 3,424,624 | (5,006) |  | (2,401,988) | $ (83,673) |  |  | 935,557
Stockholders' Equity, Beginning, shares at Dec. 31, 2020 | 160,014,960 |  |  |  |  | (7,052,769) |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Treasury stock purchased |  |  |  |  |  | $ (2,409) |  |  | (2,409)
Treasury stock purchased, shares |  |  |  |  |  | (277,316) |  |  |
Cash dividends |  |  |  |  | (66,992) |  |  |  | (66,992)
Shares issued under ESPP |  | 546 |  |  |  |  |  |  | 546
Shares issued under ESPP (in shares) | 66,541 |  |  |  |  |  |  |  |
Stock-based compensation, net of forfeitures | $ 10 | 8,731 |  |  |  |  |  |  | 8,741
Stock-based compensation, net of forfeitures, shares | 1,020,756 |  |  |  |  | (72,103) |  |  |
Net proceeds from issuance of common stock | $ 4 | 3,397 |  |  |  |  |  |  | 3,401
Net proceeds from issuance of common stock (in shares) | 357,148 |  |  |  |  |  | 357,148 |  |
Comprehensive income (loss) |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 22,225 |  |  |  | 22,225
Interest rate swap gain (loss), net of reclassifications to earnings |  |  | 2,547 |  |  |  |  |  | 2,547
Amortization of dedesignated interest rate swaps |  |  | 431 |  |  |  |  |  | 431
Ending balance at Sep. 30, 2021 | $ 1,614 | 3,437,298 | (2,028) |  | (2,446,755) | $ (86,082) |  |  | 904,047
Stockholders' Equity, Ending, shares at Sep. 30, 2021 | 161,459,405 |  |  |  |  | (7,402,188) |  |  |
Beginning balance at Jun. 30, 2021 | $ 1,613 | 3,434,224 | (3,044) |  | (2,433,553) | $ (85,419) |  |  | 913,821
Stockholders' Equity, Beginning, shares at Jun. 30, 2021 | 161,339,554 |  |  |  |  | (7,278,449) |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Treasury stock purchased |  |  |  |  |  | $ (663) |  |  | (663)
Treasury stock purchased, shares |  |  |  |  |  | (92,540) |  |  |
Cash dividends |  |  |  |  | (22,506) |  |  |  | (22,506)
Shares issued under ESPP |  | 175 |  |  |  |  |  |  | 175
Shares issued under ESPP (in shares) | 22,425 |  |  |  |  |  |  |  |
Stock-based compensation, net of forfeitures | $ 1 | 2,899 |  |  |  |  |  |  | 2,900
Stock-based compensation, net of forfeitures, shares | 97,426 |  |  |  |  | (31,199) |  |  |
Comprehensive income (loss) |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 9,304 |  |  |  | 9,304
Interest rate swap gain (loss), net of reclassifications to earnings |  |  | 585 |  |  |  |  |  | 585
Amortization of dedesignated interest rate swaps |  |  | 431 |  |  |  |  |  | 431
Ending balance at Sep. 30, 2021 | $ 1,614 | $ 3,437,298 | $ (2,028) |  | $ (2,446,755) | $ (86,082) |  |  | $ 904,047
Stockholders' Equity, Ending, shares at Sep. 30, 2021 | 161,459,405 |  |  |  |  | (7,402,188) |  |  |

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