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Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Net income loss available to common stockholders |  |  |  |  |
Net income | $ 17,079 | $ 34,035 | $ 22,183 | $ 57,743 |
Net income applicable to preferred stock |  | 3,151 |  | 5,452 |
Net income applicable to common stock | $ 17,079 | $ 30,884 | $ 22,183 | $ 52,291 |
Determination of shares: |  |  |  |  |
Weighted-average common shares outstanding (in shares) | 90,928,000 | 81,647,000 | 90,840,000 | 81,308,000 |
Assumed conversion of dilutive employee stock-based awards (in shares) | 2,230,000 | 1,474,000 | 1,629,000 | 1,459,000 |
Assumed conversion of restricted stock (in shares) | 81,000 | 34,000 | 74,000 | 42,000 |
Diluted weighted-average common shares outstanding before participating security | 93,239,000 | 83,155,000 | 92,543,000 | 82,809,000 |
Assumed conversion of preferred stock (in shares) |  | 8,331,000 |  | 8,478,000 |
Diluted weighted-average common shares outstanding (in shares) | 93,239,000 | 91,486,000 | 92,543,000 | 91,287,000 |
Calculation of basic EPS: |  |  |  |  |
Net income applicable to common stock | $ 17,079 | $ 30,884 | $ 22,183 | $ 52,291 |
Weighted-average common shares outstanding (in shares) | 90,928,000 | 81,647,000 | 90,840,000 | 81,308,000 |
Basic EPS (in dollars per share) | $ 0.19 | $ 0.38 | $ 0.24 | $ 0.64 |
Calculation of diluted EPS using two class method: |  |  |  |  |
Net income applicable to common stock | $ 17,079 | $ 30,884 | $ 22,183 | $ 52,291 |
Diluted weighted-average common shares outstanding before participating security | 93,239,000 | 83,155,000 | 92,543,000 | 82,809,000 |
Diluted EPS (in dollars per share) | $ 0.18 | $ 0.37 | $ 0.24 | $ 0.63 |
Anti-dilutive securities, options to purchase shares outstanding | 55,062 | 1,696,858 | 1,598,500 | 2,889,501 |
Series C Preferred Stock |  |  |  |  |
Earnings Per Share |  |  |  |  |
Preferred stock, shares outstanding | 0 | 7,447 | 0 | 7,447 | 0

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