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Significant Accounting Policies (Table) | 12 Months Ended
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Dec. 31, 2012
Significant Accounting Policies |
Schedule of reconciliation of weighted average shares outstanding |
(In thousands except per share data ) |  | 2012 |  |  | 2011 |  |  | 2010 |
Net income available for stockholders: |  | $ | 274,436 |  |  | $ | 296,381 |  |  | $ | 146,742 |
Less: Dividends paid |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  | (111,966 | ) |  |  | (46,479 | ) |  |  | (20,294 | )
Restricted shares of common stock |  |  | (2,103 | ) |  |  | (848 | ) |  |  | (353 | )
Undistributed earnings |  | $ | 160,367 |  |  | $ | 249,054 |  |  | $ | 126,095 |
Allocation of undistributed earnings: |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  | $ | 157,093 |  |  | $ | 244,053 |  |  | $ | 123,536 |
Restricted shares of common stock |  |  | 3,274 |  |  |  | 5,001 |  |  |  | 2,559 |
Basic shares outstanding : |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  | 210,707 |  |  |  | 213,153 |  |  |  | 212,799 |
Restricted shares of common stock |  |  | 4,534 |  |  |  | 4,530 |  |  |  | 4,685 |
|  |  | 215,241 |  |  |  | 217,683 |  |  |  | 217,484 |
Diluted shares outstanding : |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  | 210,707 |  |  |  | 213,153 |  |  |  | 212,799 |
Dilutive effect of stock-based awards |  |  | 1,555 |  |  |  | 2,567 |  |  |  | 2,321 |
|  |  | 212,262 |  |  |  | 215,720 |  |  |  | 215,120 |
Restricted shares of common stock |  |  | 4,534 |  |  |  | 4,530 |  |  |  | 4,685 |
|  |  | 216,796 |  |  |  | 220,250 |  |  |  | 219,805 |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Common stock: |  |  |  |  |  |  |  |  |  |  |  |
Distributed earnings |  | $ | 0.53 |  |  | $ | 0.22 |  |  | $ | 0.10 |
Undistributed earnings |  |  | 0.75 |  |  |  | 1.14 |  |  |  | 0.57 |
|  | $ | 1.28 |  |  | $ | 1.36 |  |  | $ | 0.67 |
Restricted shares of common stock: |  |  |  |  |  |  |  |  |  |  |  |
Distributed earnings |  | $ | 0.46 |  |  | $ | 0.19 |  |  | $ | 0.08 |
Undistributed earnings |  |  | 0.72 |  |  |  | 1.10 |  |  |  | 0.55 |
|  | $ | 1.18 |  |  | $ | 1.29 |  |  | $ | 0.63 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Common Stock: |  |  |  |  |  |  |  |  |  |  |  |
Distributed earnings |  | $ | 0.53 |  |  | $ | 0.22 |  |  | $ | 0.10 |
Undistributed earnings |  |  | 0.74 |  |  |  | 1.13 |  |  |  | 0.57 |
|  | $ | 1.27 |  |  | $ | 1.35 |  |  | $ | 0.67 |

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- Definition Tabular disclosure of the reconciliation of basic net earnings per share (or unit) to 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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