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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012
Stockholders' Equity Note [Abstract] |  |
Schedule of Stockholders Equity |
| Preferred stock |  | Preference stock |  | Common stock |  | Additional paid-in capital |  | Retained earnings |  | Accumulated other comprehensive loss |  | Treasury stock |  | Total equity
Balance at January 1, 2013 | $ | 4 |  |  | $ | 648 |  |  | $ | 323,338 |  |  | $ | 223,847 |  |  | $ | 4,744,802 |  |  | $ | (681,213 | ) |  | $ | (4,500,795 | ) |  | $ | 110,631 |
Net income | — |  |  | — |  |  | — |  |  | — |  |  | 52,746 |  |  | — |  |  | — |  |  | 52,746 |
Other comprehensive income | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (15,380 | ) |  | — |  |  | (15,380 | )
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common ($0.75 per share) | — |  |  | — |  |  | — |  |  | — |  |  | (150,920 | ) |  | — |  |  | — |  |  | (150,920 | )
Preference | — |  |  | — |  |  | — |  |  | — |  |  | (35 | ) |  | — |  |  | — |  |  | (35 | )
Issuances of common stock | — |  |  | — |  |  | — |  |  | (33,412 | ) |  | — |  |  | — |  |  | 35,546 |  |  | 2,134 |
Conversions to common stock | — |  |  | (40 | ) |  | — |  |  | (853 | ) |  | — |  |  | — |  |  | 893 |  |  | — |
Stock-based compensation expense | — |  |  | — |  |  | — |  |  | 12,061 |  |  | — |  |  | — |  |  | — |  |  | 12,061 |
Balance at September 30, 2013 | $ | 4 |  |  | $ | 608 |  |  | $ | 323,338 |  |  | $ | 201,643 |  |  | $ | 4,646,593 |  |  | $ | (696,593 | ) |  | $ | (4,464,356 | ) |  | $ | 11,237 |
| Preferred stock |  | Preference stock |  | Common stock |  | Additional paid-in capital |  | Retained earnings |  | Accumulated other comprehensive loss |  | Treasury stock |  | Total equity
Balance at January 1, 2012 | $ | 4 |  |  | $ | 659 |  |  | $ | 323,338 |  |  | $ | 240,584 |  |  | $ | 4,600,217 |  |  | $ | (661,645 | ) |  | $ | (4,542,143 | ) |  | $ | (38,986 | )
Net income | — |  |  | — |  |  | — |  |  | — |  |  | 334,826 |  |  | — |  |  | — |  |  | 334,826 |
Other comprehensive income | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 35,777 |  |  | — |  |  | 35,777 |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common ($1.125 per share) | — |  |  | — |  |  | — |  |  | — |  |  | (225,244 | ) |  | — |  |  | — |  |  | (225,244 | )
Preference | — |  |  | — |  |  | — |  |  | — |  |  | (38 | ) |  | — |  |  | — |  |  | (38 | )
Issuances of common stock | — |  |  | — |  |  | — |  |  | (31,306 | ) |  | — |  |  | — |  |  | 36,138 |  |  | 4,832 |
Conversions to common stock | — |  |  | (6 | ) |  | — |  |  | (124 | ) |  | — |  |  | — |  |  | 130 |  |  | — |
Stock-based compensation expense | — |  |  | — |  |  | — |  |  | 13,466 |  |  | — |  |  | — |  |  | — |  |  | 13,466 |
Balance at September 30, 2012 | $ | 4 |  |  | $ | 653 |  |  | $ | 323,338 |  |  | $ | 222,620 |  |  | $ | 4,709,761 |  |  | $ | (625,868 | ) |  | $ | (4,505,875 | ) |  | $ | 124,633 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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