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Equity (Details) (USD $) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 28, 2013 | Jul. 31, 2012 | Feb. 29, 2012 | Dec. 31, 2012 item | Dec. 31, 2011 | Dec. 31, 2010 | May 16, 2012 | May 31, 2005
Common Stock |  |  |  |  |  |  |  |
Common stock quarterly dividend per share, after increase (in dollars per share) | $ 0.30 | $ 0.25 | $ 0.15 | $ 0.80 | $ 0.48 | $ 0.40 |  |
Common stock quarterly dividend per share, before increase (in dollars per share) |  |  | $ 0.12 |  |  |  |  |
Number of common stock share authorized before amendment to Restated Articles of Incorporation |  |  |  |  |  |  | 100,000,000 |
Number of common stock shares authorized |  |  |  | 200,000,000 | 100,000,000 |  | 200,000,000 |
Votes per share of common stock |  |  |  | 1 |  |  |  |
Share Repurchase Program |  |  |  |  |  |  |  |
Number of shares authorized by the Board of Directors to be repurchased under stock repurchase program |  |  |  |  |  |  |  | 12,000,000
Remaining number of common stock authorized for repurchase under stock repurchase program (in shares) |  |  |  | 7,883,033 | 7,883,033 |  |  |
Preferred Stock |  |  |  |  |  |  |  |
Authorized preferred stock |  |  |  | 5,000,000 | 5,000,000 |  |  |
Minimum number of series in which preferred shares may be issued |  |  |  | 1 |  |  |  |

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