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Earnings per common share (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Schedule of weighted average number of shares [Table Text Block] | A reconciliation of the weighted average common shares outstanding used in the basic and diluted earnings per share calculation was as follows:
| Three Months Ended | Six Months Ended
| June 30, | June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012 |
| (In thousands) |  |
Weighted average common shares outstanding - basic | 188,831 |  | 188,831 |  | 188,831 |  | 188,821 |
Effect of dilutive stock options and performance share awards | 632 |  | 276 |  | 629 |  | 275 |
Weighted average common shares outstanding - diluted | 189,463 |  | 189,107 |  | 189,460 |  | 189,096 |
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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