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Income Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Computations of Basic and Diluted Income Loss Per Common Share | Basic income or loss per share attributable to common shareholders is computed as (1) income or loss attributable to common shareholders (2) less income allocable to participating securities (3) divided by weighted average basic shares outstanding. Diluted income or loss per share attributable to common shareholders is computed as (1) basic income or loss attributable to common shareholders (2) plus diluted adjustments to income allocable to participating securities (3) divided by weighted average diluted shares outstanding. The following tables set forth a reconciliation of income or loss attributable to common shareholders to basic income or loss attributable to common shareholders to diluted income or loss attributable to common shareholders (in thousands except per share amounts):
|  | Three Months Ended March 31, |  |
| 2018 |  |  |  | 2017 |  |
Net income, as reported | $ | 49,238 |  |  | $ | 170,111 |  |
Participating earnings (a) |  | (568 | ) |  |  | (1,882 | ) |
Basic net income attributed to common shareholders |  | 48,670 |  |  |  | 168,229 |  |
Reallocation of participating earnings (a) |  | 2 |  |  |  | 1 |  |
Diluted net income attributed to common shareholders | $ | 48,672 |  |  | $ | 168,230 |  |
Net income per common share: |  |  |  |  |  |  |  |
Basic | $ | 0.20 |  |  | $ | 0.69 |  |
Diluted | $ | 0.20 |  |  | $ | 0.69 |  |
(a) | Restricted Stock Awards represent participating securities because they participate in nonforfeitable dividends or distributions with common equity owners. Income allocable to participating securities represents the distributed and undistributed earnings attributable to the participating securities. Participating securities, however, do not participate in undistributed net losses.
Basic Weighted Average Common Shares Outstanding to Diluted Weighted Average Common Shares Outstanding | The following table provides a reconciliation of basic weighted average common shares outstanding to diluted weighted average common shares outstanding (in thousands):
|  | Three Months Ended March 31, |  |
| 2018 |  |  |  | 2017 |  |
Weighted average common shares outstanding-basic |  | 245,709 |  |  |  | 244,652 |  |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Director and employee restricted stock and performance-based equity awards |  | 885 |  |  |  | 151 |  |
Weighted average common shares outstanding-diluted |  | 246,594 |  |  |  | 244,803 |  |

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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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- 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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