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Consolidated Statement of Changes in Stockholders' Equity - USD ($) | Total | Common Stock | Additional Paid-in Capital | Retained Earnings/(Accumulated Deficit) | Accumulated Other Comprehensive Loss, Net | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 438,087,000 | $ 1,093,000 | $ 922,112,000 | $ (485,115,000) | $ (53,000) | $ 50,000
Balance, shares at Dec. 31, 2014 |  | 109,277,060 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 47,234,000 | $ 0 | 0 | 47,234,000 | 0 | 0
Unrealized loss on investment available for sale | $ (263,000) | $ 0 | 0 | 0 | (263,000) | 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 1,301,789 | 1,301,789 |  |  |  |
Stock options exercised, value | $ 9,807,000 | $ 13,000 | 9,794,000 | 0 | 0 | 0
Award of restricted stock units, shares |  | 553,822 |  |  |  |
Award of restricted stock units | (3,672,000) | $ (6,000) | 3,678,000 | 0 | 0 | 0
Stock Issued During Period, Shares, Performance Stock Award, Net |  | 481,749 |  |  |  |
Stock Issued During Period, Values, Performance Stock Award, Net | (2,446,000) | $ 5,000 | (2,451,000) | 0 | 0 | 0
Stock Repurchased and Retired During Period, Value | 0 |  |  |  |  |
Share-based compensation costs | 19,264,000 | 0 | (19,264,000) | 0 | 0 | 0
Net Income (Loss) Attributable to Parent | 47,234,000 |  |  |  |  |
Balance at Dec. 31, 2015 | 508,011,000 | $ 1,117,000 | 945,041,000 | (437,881,000) | (316,000) | 50,000
Balance, shares at Dec. 31, 2015 |  | 111,614,420 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 418,003,000 | $ 0 | 0 | 418,003,000 | 0 | 0
Unrealized loss on investment available for sale | $ (299,000) | $ 0 | 0 | 0 | (299,000) | 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 452,898 | 452,898 |  |  |  |
Stock options exercised, value | $ 2,940,000 | $ 4,000 | 2,936,000 | 0 | 0 | 0
Award of restricted stock units, shares |  | 670,032 |  |  |  |
Award of restricted stock units | (3,368,000) | $ (6,000) | (3,374,000) | 0 | 0 | 0
Stock Issued During Period, Shares, Performance Stock Award, Net |  | 159,027 |  |  |  |
Stock Issued During Period, Values, Performance Stock Award, Net | (867,000) | $ 2,000 | (869,000) | 0 | 0 | 0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation | (5,812,000) | 0 | 5,812,000 | 0 | 0 | 0
Stock Repurchased and Retired During Period, Value | 0 |  |  |  |  |
Share-based compensation costs | 15,518,000 | 0 | 15,518,000 | 0 | 0 | 0
Net Income (Loss) Attributable to Parent | 418,003,000 |  |  |  |  |
Balance at Dec. 31, 2016 | $ 934,126,000 | $ 1,129,000 | 953,440,000 | (19,878,000) | (615,000) | 50,000
Balance, shares at Dec. 31, 2016 | 112,896,377 | 112,896,377 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 15,777,000 | $ 0 | 0 | 15,777,000 | 0 | 0
Net income (loss) | 189,193,000 | 0 | 0 | 189,193,000 | 0 | 0
Unrealized loss on investment available for sale | $ 433,000 | $ 0 | 0 | 0 | 433,000 | 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 241,964 | 241,964 |  |  |  |
Stock options exercised, value | $ 2,084,000 | $ 2,000 | 2,082,000 | 0 | 0 | 0
Award of restricted stock units, shares |  | 520,854 |  |  |  |
Award of restricted stock units | (8,004,000) | $ (5,000) | (8,009,000) | 0 | 0 | 0
Stock Issued During Period, Shares, Performance Stock Award, Net |  | 173,653 |  |  |  |
Stock Issued During Period, Values, Performance Stock Award, Net | 1,791,000 | $ 2,000 | 1,793,000 | 0 | 0 | 0
Dividends, Cash | $ (16,918,000) | $ 0 | 0 | (16,918,000) | 0 | 0
Stock Repurchased and Retired During Period, Shares | 1,198,000 | (1,198,430) |  |  |  |
Stock Repurchased and Retired During Period, Value | $ (31,927,000) | $ (12,000) | (31,915,000) | 0 | 0 | 0
Share-based compensation costs | 17,413,000 | 0 | 17,413,000 | 0 | 0 | 0
Net Income (Loss) Attributable to Parent | 189,193,000 | 0 | 640,000 | 0 | 0 |
Noncontrolling Interest, Decrease from Deconsolidation | 590,000 |  |  |  |  | (50,000)
Balance at Dec. 31, 2017 | $ 1,100,976,000 | $ 1,126,000 | $ 931,858,000 | $ 168,174,000 | $ (182,000) | $ 0
Balance, shares at Dec. 31, 2017 | 112,634,418 | 112,634,418 |  |  |  |

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