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Earnings (loss) per common share (Tables) | 6 Months Ended
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Jun. 30, 2015
Earnings Per Share [Abstract] |
Weighted average common shares outstanding | A reconciliation of the weighted average common shares outstanding used in the basic and diluted earnings (loss) per share calculations was as follows:
| Three Months Ended | Six Months Ended
| June 30, | June 30,
| 2015 |  | 2014 |  | 2015 |  | 2014 |
| (In thousands)
Weighted average common shares outstanding - basic | 194,805 |  | 192,060 |  | 194,643 |  | 190,946 |
Effect of dilutive performance share awards | 33 |  | 599 |  | 32 |  | 597 |
Weighted average common shares outstanding - diluted | 194,838 |  | 192,659 |  | 194,675 |  | 191,543 |
Shares excluded from the calculation of diluted earnings per share | — |  | — |  | — |  | — |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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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