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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Deficit [Member] | Accum. Other Comprehensive Income (Loss) [Member] | Non-Controlling Interests [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Beginning at Dec. 31, 2015 | $ 1 | $ 43 | $ 902,843 | $ (532,383) | $ 1,040 |  | $ 371,544 |
Balance at Beginning (in shares) at Dec. 31, 2015 | 927 | 42,515 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax |  | $ 1 | 2,281 |  |  |  | 2,282 |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax (in shares) |  | 659 |  |  |  |  |  |
Pension plan adjustment |  |  |  |  | (3,660) |  | (3,660) |
Warrant and option exercises |  |  | 1,338 |  |  |  | 1,338 |
Warrant and option exercises (in shares) |  | 138 |  |  |  |  |  |
Sale of Pacific Aurora interests to ACEC |  |  | 10,475 |  |  | $ 19,525 | 30,000 |
ACEC contribution to form Pacific Aurora |  |  | 5,761 |  |  | 10,739 | 16,500 |
Preferred stock dividends |  |  |  | (1,269) |  |  | (1,269) |
Net income (loss) |  |  |  | 1,419 |  | 107 | 1,526 |
Balance at End at Dec. 31, 2016 | $ 1 | $ 44 | 922,698 | (532,233) | (2,620) | 30,371 | 418,261 |
Balance at End (in shares) at Dec. 31, 2016 | 927 | 43,312 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax |  |  | 3,014 |  |  |  | 3,014 |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax (in shares) |  | 473 |  |  |  |  |  |
Pension plan adjustment |  |  |  |  | 386 |  | 386 |
Warrant and option exercises |  |  | 1,378 |  |  |  | 1,378 |
Warrant and option exercises (in shares) |  | 201 |  |  |  |  |  |
Preferred stock dividends |  |  |  | (1,265) |  |  | (1,265) |
Net income (loss) |  |  |  | (34,964) |  | (3,110) | (38,074) |
Balance at End at Dec. 31, 2017 | $ 1 | $ 44 | 927,090 | (568,462) | (2,234) | 27,261 | 383,700 |
Balance at End (in shares) at Dec. 31, 2017 | 927 | 43,986 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax |  |  | 735 |  |  |  | 735 |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax (in shares) |  | (31) |  |  |  |  |  |
Preferred stock dividends |  |  |  | (312) |  |  | (312) |
Net income (loss) |  |  |  | (7,841) |  | (1,656) | (9,497) |
Balance at End at Mar. 31, 2018 | $ 1 | $ 44 | 927,825 | (576,615) | (2,234) | 25,605 | 374,626 |
Balance at End (in shares) at Mar. 31, 2018 | 927 | 43,955 |  |  |  |  |  |
Balance at Beginning at Dec. 31, 2017 | $ 1 | $ 44 | 927,090 | (568,462) | (2,234) | 27,261 | 383,700 |
Balance at Beginning (in shares) at Dec. 31, 2017 | 927 | 43,986 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  |  | (946) |
Net income (loss) |  |  |  |  |  |  | (33,405) |
Balance at End at Sep. 30, 2018 | $ 1 | $ 45 | 929,262 | (597,671) | (2,234) | 22,119 | 351,522 |
Balance at End (in shares) at Sep. 30, 2018 | 927 | 44,947 |  |  |  |  |  |
Balance at Beginning at Dec. 31, 2017 | $ 1 | $ 44 | 927,090 | (568,462) | (2,234) | 27,261 | 383,700 |
Balance at Beginning (in shares) at Dec. 31, 2017 | 927 | 43,986 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax |  | $ 1 | 3,033 |  |  |  | 3,034 |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax (in shares) |  | 947 |  |  |  |  |  |
Issuances of common stock |  | $ 1 | 2,056 |  |  |  | 2,057 |
Issuances of common stock (in shares) |  | 838 |  |  |  |  |  |
Pension plan adjustment |  |  |  |  | (225) |  | (225) |
Preferred stock dividends |  |  |  | (1,265) |  |  | (1,265) |
Net income (loss) |  |  |  | (60,273) |  | (7,663) | (67,936) |
Balance at End at Dec. 31, 2018 | $ 1 | $ 46 | 932,179 | (630,000) | (2,459) | 19,598 | 319,365 | [1]
Balance at End (in shares) at Dec. 31, 2018 | 927 | 45,771 |  |  |  |  |  |
Balance at Beginning at Mar. 31, 2018 | $ 1 | $ 44 | 927,825 | (576,615) | (2,234) | 25,605 | 374,626 |
Balance at Beginning (in shares) at Mar. 31, 2018 | 927 | 43,955 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax |  | $ 1 | 553 |  |  |  | 554 |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax (in shares) |  | 1,006 |  |  |  |  |  |
Preferred stock dividends |  |  |  | (315) |  |  | (315) |
Net income (loss) |  |  |  | (12,908) |  | (1,696) | (14,604) |
Balance at End at Jun. 30, 2018 | $ 1 | $ 45 | 928,378 | (589,838) | (2,234) | 23,909 | 360,261 |
Balance at End (in shares) at Jun. 30, 2018 | 927 | 44,961 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax |  |  | 884 |  |  |  | 884 |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax (in shares) |  | (14) |  |  |  |  |  |
Preferred stock dividends |  |  |  | (319) |  |  | (319) |
Net income (loss) |  |  |  | (7,514) |  | (1,790) | (9,304) |
Balance at End at Sep. 30, 2018 | $ 1 | $ 45 | 929,262 | (597,671) | (2,234) | 22,119 | 351,522 |
Balance at End (in shares) at Sep. 30, 2018 | 927 | 44,947 |  |  |  |  |  |
Balance at Beginning at Dec. 31, 2018 | $ 1 | $ 46 | 932,179 | (630,000) | (2,459) | 19,598 | 319,365 | [1]
Balance at Beginning (in shares) at Dec. 31, 2018 | 927 | 45,771 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax |  |  | 797 |  |  |  | 797 |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax (in shares) |  | (24) |  |  |  |  |  |
Issuances of common stock |  | $ 3 | 3,667 |  |  |  | 3,670 |
Issuances of common stock (in shares) |  | 3,137 |  |  |  |  |  |
Preferred stock dividends |  |  |  | (312) |  |  | (312) |
Net income (loss) |  |  |  | (12,890) |  | (1,271) | (14,161) |
Balance at End at Mar. 31, 2019 | $ 1 | $ 49 | 936,643 | (643,202) | (2,459) | 18,327 | 309,359 |
Balance at End (in shares) at Mar. 31, 2019 | 927 | 48,884 |  |  |  |  |  |
Balance at Beginning at Dec. 31, 2018 | $ 1 | $ 46 | 932,179 | (630,000) | (2,459) | 19,598 | 319,365 | [1]
Balance at Beginning (in shares) at Dec. 31, 2018 | 927 | 45,771 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  |  | (946) |
Net income (loss) |  |  |  |  |  |  | (51,524) |
Balance at End at Sep. 30, 2019 | $ 1 | $ 50 | 937,795 | (678,808) | (2,459) | 15,936 | 272,515 |
Balance at End (in shares) at Sep. 30, 2019 | 927 | 49,784 |  |  |  |  |  |
Balance at Beginning at Mar. 31, 2019 | $ 1 | $ 49 | 936,643 | (643,202) | (2,459) | 18,327 | 309,359 |
Balance at Beginning (in shares) at Mar. 31, 2019 | 927 | 48,884 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax |  | $ 1 | 565 |  |  |  | 566 |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax (in shares) |  | 954 |  |  |  |  |  |
Preferred stock dividends |  |  |  | (315) |  |  | (315) |
Net income (loss) |  |  |  | (7,646) |  | (644) | (8,290) |
Balance at End at Jun. 30, 2019 | $ 1 | $ 50 | 937,208 | (651,163) | (2,459) | 17,683 | 301,320 |
Balance at End (in shares) at Jun. 30, 2019 | 927 | 49,838 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax |  |  | 587 |  |  |  | 587 |
Stock-based compensation expense – restricted stock issued to employees and directors, net of cancellations and tax (in shares) |  | (54) |  |  |  |  |  |
Preferred stock dividends |  |  |  | (319) |  |  | (319) |
Net income (loss) |  |  |  | (27,326) |  | (1,747) | (29,073) |
Balance at End at Sep. 30, 2019 | $ 1 | $ 50 | $ 937,795 | $ (678,808) | $ (2,459) | $ 15,936 | $ 272,515 |
Balance at End (in shares) at Sep. 30, 2019 | 927 | 49,784 |  |  |  |  |  |
[1] | Amounts derived from the audited consolidated financial statements for the year ended December 31, 2018.

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