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Earnings per share | 3 Months Ended
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Mar. 31, 2016
Earnings Per Share [Abstract] |
Earnings per share | Earnings per share The calculation of basic and diluted earnings per share for each period presented was as follows (dollars and shares in thousands, except per share amounts):
| Three Months Ended March 31,
| 2016 |  | 2015
Net income (loss) attributable to common stockholders | $ | (22,943 | ) |  | $ | 28,672 |
Average shares outstanding (basic) | 90,477 |  |  | 89,482 |
Common stock equivalents | — |  |  | 1,987 |
Diluted shares | 90,477 |  |  | 91,469 |
Earnings(losses) per share |  |  |
Basic earnings (losses) per share | $ | (0.25 | ) |  | $ | 0.32 |
Diluted earnings (losses) per share | $ | (0.25 | ) |  | $ | 0.31 |
The diluted earnings per share calculation excludes all stock options for the three months ended March 31, 2016 because there is a net loss for the quarter. The diluted earnings per share calculation excludes approximately 1.6 million stock options for the three months ended March 31, 2015, because they were anti-dilutive as the option exercise price was greater than the average market price of the Company's common stock.

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