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Earnings (loss) per common share (Tables) | 9 Months Ended
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Sep. 30, 2016
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 | Nine Months Ended
| September 30, | September 30,
| 2016 |  | 2015 |  | 2016 |  | 2015 |
| (In thousands)
Weighted average common shares outstanding - basic | 195,304 |  | 195,151 |  | 195,298 |  | 194,814 |
Effect of dilutive performance share awards | 507 |  | 18 |  | 496 |  | 19 |
Weighted average common shares outstanding - diluted | 195,811 |  | 195,169 |  | 195,794 |  | 194,833 |
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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