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Net Income Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Net Income Per Common Share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  | $ 55,405 |  | $ 50,306 |  | $ 48,620 |
Less net income allocated to non-controlling interests |  |  |  |  |  |  |  |  |  |  | (37) |  | (191) |
Less net income allocated to participating securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonforfeitable dividends on participating securities |  |  |  |  |  |  |  |  | (381) |  | (377) |  | (342) |
Income allocated to participating securities |  |  |  |  |  |  |  |  | (2) |  |  |  |  |
Total net income allocated to participating securities |  |  |  |  |  |  |  |  | (383) |  | (377) |  | (342) |
Less net income allocated to preferred stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  |  |  |  | (3,272) |  | (3,273) |  | (5,512) |
Preferred stock redemption charge |  |  |  |  |  |  |  |  |  |  |  |  | (3,566) |
Total net income allocated to preferred stockholders |  |  |  |  |  |  |  |  | (3,273) |  | (3,273) |  | (9,078) |
Income from continuing operations available to common stockholders |  |  |  |  |  |  |  |  | 51,749 |  | 46,619 |  | 39,009 |
Discontinued operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from discontinued operations |  |  |  |  |  |  |  |  | 805 |  | 1,005 |  | 823 |
Gain on sale of assets, net |  |  |  |  |  |  |  |  | 1,605 |  | 16 |  |  |
Net income (loss) from discontinued operations |  | 2,857 | (701) | 254 | 254 | 253 | 251 | 263 | 2,410 |  | 1,021 |  | 823 |
Net income available to common stockholders | 13,732 | 16,373 | 11,994 | 12,060 | 11,854 | 11,583 | 12,194 | 12,009 | 54,159 |  | 47,640 |  | 39,832 |
Net income for diluted net income per share |  |  |  |  |  |  |  |  | $ 54,159 |  | $ 47,640 |  | $ 39,832 |
Shares for basic net income per share |  |  |  |  |  |  |  |  | 33,111 |  | 30,238 |  | 29,194 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options (in shares) |  |  |  |  |  |  |  |  | 31 |  | 40 |  | 28 |
Total effect of dilutive securities (in shares) |  |  |  |  |  |  |  |  | 31 |  | 40 |  | 28 |
Shares for diluted net income per share |  |  |  |  |  |  |  |  | 33,142 |  | 30,278 |  | 29,222 |
Basic net income per share (in dollars per share) | $ 0.40 | $ 0.47 | $ 0.36 | $ 0.40 | $ 0.39 | $ 0.38 | $ 0.40 | $ 0.40 | $ 1.64 | [1] | $ 1.58 | [1] | $ 1.36 | [1]
Diluted net income per share (in dollars per share) | $ 0.40 | $ 0.47 | $ 0.36 | $ 0.40 | $ 0.39 | $ 0.38 | $ 0.40 | $ 0.40 | $ 1.63 | [1] | $ 1.57 | [1] | $ 1.36 | [1]
[1] | NOTE: Computations of per share amounts from continuing operations, discontinued operations and net income are made independently. Therefore, the sum of per share amounts from continuing operations and discontinued operations may not agree with the per share amounts from net income available to common stockholders.

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