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Condensed Consolidated Statements of Changes in Stockholders' Equity - 6 months ended Jun. 30, 2017 - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2016 | $ 768,487 | $ 1,809 | $ 3,314,590 | $ (2,545,424) | $ (2,488)
Balances, in shares at Dec. 31, 2016 |  | 180,933 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income (loss) | 7,708 |  |  | 7,708 |
Other comprehensive income (loss) | (506) |  |  |  | (506)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  | 509 |  |  |
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures | 1,822 | $ 5 | 1,817 |  |
Balances at Jun. 30, 2017 | $ 777,511 | $ 1,814 | $ 3,316,407 | $ (2,537,716) | $ (2,994)
Balances, in shares at Jun. 30, 2017 |  | 181,442 |  |  |

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