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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2017 | $ 814,977 | $ 1,856 | $ 3,357,345 | $ (2,546,743) | $ 2,519
Balances, in shares at Dec. 31, 2017 |  | 185,638 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
NET INCOME (LOSS) | 1,241 |  |  | 1,241 |
Other comprehensive income (loss) | (278) |  |  |  | (278)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  | 538 |  |  |
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures | (1,629) | $ 6 | (1,635) |  |
Balances at Mar. 31, 2018 | 814,311 | $ 1,862 | 3,355,710 | (2,542,898) | (363)
Balances, in shares at Mar. 31, 2018 |  | 186,176 |  |  |
Balances at Dec. 31, 2017 | 814,977 | $ 1,856 | 3,357,345 | (2,546,743) | 2,519
Balances, in shares at Dec. 31, 2017 |  | 185,638 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
NET INCOME (LOSS) | (48,873) |  |  |  |
Other comprehensive income (loss) | (173) |  |  |  |
Balances at Sep. 30, 2018 | 767,783 | $ 1,870 | 3,359,183 | (2,593,012) | (258)
Balances, in shares at Sep. 30, 2018 |  | 187,027 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Adoption of new accounting standard |  |  |  | 2,604 | (2,604)
Balances at Mar. 31, 2018 | 814,311 | $ 1,862 | 3,355,710 | (2,542,898) | (363)
Balances, in shares at Mar. 31, 2018 |  | 186,176 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
NET INCOME (LOSS) | 2,930 |  |  | 2,930 |
Other comprehensive income (loss) | (87) |  |  |  | (87)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  | 898 |  |  |
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures | 1,617 | $ 9 | 1,608 |  |
Balances at Jun. 30, 2018 | 818,771 | $ 1,871 | 3,357,318 | (2,539,968) | (450)
Balances, in shares at Jun. 30, 2018 |  | 187,074 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Adoption of new accounting standard | 0 |  |  |  |
NET INCOME (LOSS) | (53,044) |  |  | (53,044) |
Other comprehensive income (loss) | 192 |  |  |  | 192
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  | (47) |  |  |
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures | 1,864 | $ (1) | 1,865 |  |
Balances at Sep. 30, 2018 | 767,783 | $ 1,870 | 3,359,183 | (2,593,012) | (258)
Balances, in shares at Sep. 30, 2018 |  | 187,027 |  |  |
Balances at Dec. 31, 2018 | 852,512 | $ 2,033 | 3,443,082 | (2,592,544) | (59)
Balances, in shares at Dec. 31, 2018 |  | 203,310 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
NET INCOME (LOSS) | (19,201) |  |  | (19,201) |
Other comprehensive income (loss) | 59 |  |  |  | 59
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  | 1,801 |  |  |
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures | (1,035) | $ 18 | (1,053) |  |
Balances at Mar. 31, 2019 | 832,335 | $ 2,051 | 3,442,029 | (2,611,745) | 0
Balances, in shares at Mar. 31, 2019 |  | 205,111 |  |  |
Balances at Dec. 31, 2018 | 852,512 | $ 2,033 | 3,443,082 | (2,592,544) | (59)
Balances, in shares at Dec. 31, 2018 |  | 203,310 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
NET INCOME (LOSS) | (70,242) |  |  |  |
Other comprehensive income (loss) | 1,191 |  |  |  |
Balances at Sep. 30, 2019 | 930,807 | $ 2,405 | 3,590,056 | (2,662,786) | 1,132
Balances, in shares at Sep. 30, 2019 |  | 240,509 |  |  |
Balances at Mar. 31, 2019 | 832,335 | $ 2,051 | 3,442,029 | (2,611,745) | 0
Balances, in shares at Mar. 31, 2019 |  | 205,111 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
NET INCOME (LOSS) | (36,764) |  |  | (36,764) |
Stock Issued During Period, Shares, New Issues |  | 16,631 |  |  |
Stock Issued During Period, Value, New Issues | 48,887 | $ 166 | 48,721 |  |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  | 117 |  |  |
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures | 1,988 | $ 2 | 1,986 |  |
Balances at Jun. 30, 2019 | 846,446 | $ 2,219 | 3,492,736 | (2,648,509) | 0
Balances, in shares at Jun. 30, 2019 |  | 221,859 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
NET INCOME (LOSS) | (14,277) |  |  | (14,277) |
Other comprehensive income (loss) | 1,132 |  |  |  | 1,132
Stock Issued During Period, Shares, Extinguishment of Debt |  | 4,452 |  |  |
Stock Issued During Period, Value, Extinguishment of Debt | 21,290 | $ 44 | 21,246 | 0 | 0
Stock Issued During Period, Shares, New Issues |  | 14,220 |  |  |
Stock Issued During Period, Value, New Issues | 73,781 | $ 142 | 73,639 |  |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  | (22) |  |  |
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures | 2,435 | $ 0 | 2,435 |  |
Balances at Sep. 30, 2019 | $ 930,807 | $ 2,405 | $ 3,590,056 | $ (2,662,786) | $ 1,132
Balances, in shares at Sep. 30, 2019 |  | 240,509 |  |  |

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