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Unaudited Condensed Consolidated Statement of Equity - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands | Total | Common Stock | Treasury Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings (Accumulated Deficit) | Non-controlling Interests
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2016 |  | 59,685,000 | 2,029,000 |  |  |  |
Beginning balance at Dec. 31, 2016 | $ 287,701 | $ 6 | $ (20,269) | $ 318,392 | $ (956) | $ (9,830) | $ 358
Increase (Decrease) in Equity [Roll Forward] |  |  |  |  |  |  |
Net loss | (15,803) |  |  |  |  | (15,803) |
Foreign currency translation adjustment | (14) |  |  |  | (14) |  |
Stock issued in payment of stock purchase plan (in shares) |  |  | (40,000) |  |  |  |
Stock issued under employee stock purchase plan | 368 |  |  | 368 |  |  |
Common stock issued in payment of accrued liability | $ 188 |  |  | 188 |  |  |
Stock options exercised (in shares) | 651,188 | 651,000 |  |  |  |  |
Stock options exercised | $ 5,834 |  |  | 5,834 |  |  |
Stock surrendered for exercise of stock options (in shares) |  |  | 470,000 |  |  |  |
Exercise of stock options by common stock surrender | $ 5,814 |  | $ 5,814 |  |  |  |
Restricted stock granted (in shares) | 168,756 | 169,000 |  |  |  |  |
Restricted stock forfeited (in shares) |  |  | 76,000 |  |  |  |
Treasury stock purchased (in shares) |  |  | 125,000 |  |  |  |
Treasury stock purchased | $ (1,335) |  | $ (1,335) |  |  |  |
Stock compensation expense | 6,344 |  |  | 6,344 |  |  |
Treasury stock purchased (in shares) |  |  | 50,000 |  |  |  |
Treasury stock purchased | (487) |  | $ (487) |  |  |  |
Ending balance (in shares) at Jun. 30, 2017 |  | 60,505,000 | 2,710,000 |  |  |  |
Ending balance at Jun. 30, 2017 | $ 276,982 | $ 6 | $ (27,905) | $ 331,126 | $ (970) | $ (25,633) | $ 358

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