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Earnings per share (Tables) | 3 Months Ended
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Mar. 31, 2016
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | 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 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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