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Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - 6 months ended Jun. 30, 2016 - 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, 2015 |  | 139,076 | 508 |  |
Balance at Dec. 31, 2015 | $ 2,319,342 | $ 1,376 | $ (13,620) | $ 1,497,065 | $ 834,521
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock, shares |  | 39,100 |  |  |
Issuance of common stock | 182,953 | $ 391 |  | 182,562 |
Stock-based compensation, shares |  | 2,517 |  |  |
Stock-based compensation | 13,966 |  |  | 13,966 |
Vesting of restricted shares | 0 | $ 10 |  | (10) |
Treasury stock - tax withholdings, shares |  | (294) | 294 |  |
Treasury stock – tax withholdings | (1,520) |  | $ (1,520) |  |
Net loss | (154,386) |  |  |  | (154,386)
Balance, shares at Jun. 30, 2016 |  | 180,399 | 802 |  |
Balance at Jun. 30, 2016 | $ 2,360,355 | $ 1,777 | $ (15,140) | $ 1,693,583 | $ 680,135

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