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EARNINGS PER SHARE (Notes) | 6 Months Ended
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Jun. 30, 2018
EARNINGS PER SHARE [Line Items] |
Earnings Per Share [Text Block] |
8. | EARNINGS PER SHARE
Basic EPS is based on net income and is calculated based upon the daily weighted-average number of common shares outstanding during the periods presented. Also, this calculation includes fully vested stock awards that have not yet been issued as common stock. Diluted EPS includes basic EPS, plus unvested stock awards granted under our compensation plans, but only to the extent these instruments dilute earnings per share. The following tables set forth the computation of basic and diluted EPS from continuing operations for the periods indicated:
| Three Months Ended June 30, 2018
| Income |  | Shares |  | Per Share Amount
| (Thousands, except per share amounts)
Basic EPS Calculation |  |  |  |  |
Net income available for common stock | $ | 20,419 |  |  | 52,692 |  |  | $ | 0.39 |
Diluted EPS Calculation |  |  |  |  |  |  |  |
Effect of dilutive securities | — |  |  | 207 |  |  |  |
Net income available for common stock and common stock equivalents | $ | 20,419 |  |  | 52,899 |  |  | $ | 0.39 |
| Three Months Ended June 30, 2017
| Income |  | Shares |  | Per Share Amount
| (Thousands, except per share amounts)
Basic EPS Calculation |  |  |  |  |
Net income available for common stock | $ | 20,623 |  |  | 52,553 |  |  | $ | 0.39 |
Diluted EPS Calculation |  |  |  |  |  |  |
Effect of dilutive securities | — |  |  | 416 |  |  |  |
Net income available for common stock and common stock equivalents | $ | 20,623 |  |  | 52,969 |  |  | $ | 0.39 |
| Six Months Ended June 30, 2018
| Income |  | Shares |  | Per Share Amount
| (Thousands, except per share amounts)
Basic EPS Calculation |  |  |  |  |
Net income available for common stock | $ | 111,254 |  |  | 52,648 |  |  | $ | 2.11 |
Diluted EPS Calculation |  |  |  |  |  |  |  |
Effect of dilutive securities | — |  |  | 250 |  |  |  |
Net income available for common stock and common stock equivalents | $ | 111,254 |  |  | 52,898 |  |  | $ | 2.10 |
| Six Months Ended June 30, 2017
| Income |  | Shares |  | Per Share Amount
| (Thousands, except per share amounts)
Basic EPS Calculation |  |  |  |  |
Net income available for common stock | $ | 97,079 |  |  | 52,565 |  |  | $ | 1.85 |
Diluted EPS Calculation |  |  |  |  |  |  |  |
Effect of dilutive securities | — |  |  | 447 |  |  |  |
Net income available for common stock and common stock equivalents | $ | 97,079 |  |  | 53,012 |  |  | $ | 1.83 |

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- Definition [Line Items] for 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 No definition available. + Details
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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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