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Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - 6 months ended Jun. 30, 2015 - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in-Capital [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | ---
Balance, shares at Dec. 31, 2014 |  | 101,342 | 286 |  |
Balance at Dec. 31, 2014 | $ 1,872,301 | $ 1,001 | $ (10,671) | $ 1,007,202 | $ 874,769
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock | 463,010 | $ 368 |  | 462,642 |
Issuance of common stock, shares |  | 36,800 |  |  |
Stock-based compensation | 14,824 |  |  | 14,824 |
Stock-based compensation, shares |  | 1,132 |  |  |
Vesting of restricted shares | 0 | $ 4 |  | (4) |
Treasury stock – tax withholdings | (1,932) |  | $ (1,932) |  |
Treasury stock - tax withholdings, shares |  | (118) | 118 |  |
Net loss | (71,271) |  |  |  | (71,271)
Balance, shares at Jun. 30, 2015 |  | 139,156 | 404 |  |
Balance at Jun. 30, 2015 | $ 2,276,932 | $ 1,373 | $ (12,603) | $ 1,484,664 | $ 803,498

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